I replied to the email, but I will repeat the info here.
I ended up doing the steps backwards, which was just as well as I ran into javascript errors.
This is from the User post form edit screen. All I did was open it. I hadn't even tried to click on the button yet.
editor.prototype.js?ver=2.1:178 Uncaught TypeError: $ is not a function
at Toolset.CRED.UserFormsEditor.Toolset.CRED.EditorPagePrototype.initExtraEditors (editor.prototype.js?ver=2.1:178)
at Toolset.CRED.UserFormsEditor.Toolset.CRED.EditorPagePrototype.initIclEditor (editor.prototype.js?ver=2.1:49)
at Toolset.CRED.UserFormsEditor.Toolset.CRED.EditorPagePrototype.init (editor.prototype.js?ver=2.1:360)
at new Toolset.CRED.UserFormsEditor (main.js?ver=2.1:18)
at HTMLDocument.<anonymous> (main.js?ver=2.1:24)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at HTMLDocument.K (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:630 Uncaught TypeError: Cannot read property 'hasClass' of undefined
at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:630)
at HTMLDocument.dispatch (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at HTMLDocument.r.handle (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.a.event.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:9)
at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Function.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at a.fn.init.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at a.fn.init.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.<anonymous> (load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:629)
This is what I get when I open the post form for edit, also without trying to do anything. It looks to me like the same basic error, except for the slow network message at the start.
[Intervention] Slow network is detected. See hidden link for more details. Fallback font will be used while loading: hidden link
editor.prototype.js?ver=2.1:178 Uncaught TypeError: $ is not a function
at Toolset.CRED.PostFormsEditor.Toolset.CRED.EditorPagePrototype.initExtraEditors (editor.prototype.js?ver=2.1:178)
at Toolset.CRED.PostFormsEditor.Toolset.CRED.EditorPagePrototype.initIclEditor (editor.prototype.js?ver=2.1:49)
at Toolset.CRED.PostFormsEditor.Toolset.CRED.EditorPagePrototype.init (editor.prototype.js?ver=2.1:360)
at new Toolset.CRED.PostFormsEditor (main.js?ver=2.1:18)
at HTMLDocument.<anonymous> (main.js?ver=2.1:24)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at HTMLDocument.K (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
Toolset.CRED.EditorPagePrototype.initExtraEditors @ editor.prototype.js?ver=2.1:178
Toolset.CRED.EditorPagePrototype.initIclEditor @ editor.prototype.js?ver=2.1:49
Toolset.CRED.EditorPagePrototype.init @ editor.prototype.js?ver=2.1:360
Toolset.CRED.PostFormsEditor @ main.js?ver=2.1:18
(anonymous) @ main.js?ver=2.1:24
i @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2
fireWith @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2
ready @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2
K @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2
load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:630 Uncaught TypeError: Cannot read property 'hasClass' of undefined
at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:630)
at HTMLDocument.dispatch (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at HTMLDocument.r.handle (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.a.event.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:9)
at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Function.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at a.fn.init.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:2)
at a.fn.init.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,shortcode,utils,backbone,wp-util,moxiejs,plupload,jquery-ui-core,jquery-ui-widget,jquery-u&load[]=i-mouse,jquery-ui-sortable&ver=4.9.8:3)
at Object.<anonymous> (load-scripts.php?c=0&load[]=wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgarease&load[]=lect,image-edit,hoverIntent,common,admin-bar,wp-ajax-response,jquery-color,wp-lists,jquery-ui-menu,jquery-ui-autocomplete,tags-s&load[]=uggest,tags-box,word-count,post,svg-painter,thickbox,heartbeat,wp-auth-check,jquery-ui-slider,jquery-touch-punch,iris,wp-color-p&load[]=icker&ver=4.9.8:629)