Thank you for contacting us and I'd be happy to assist.
Whether you have Toolset Views or Blocks plugin active, you can follow these steps:
1. Please go to WP Admin -> Toolset -> Settings -> General, and for "Editing experience", select the option "Show both the legacy and Blocks interface and let me choose which to use for each item I build".
2. Also, for "Editor to use for Content Templates", make sure that the "Classic Editor" option is set.
After that, you'll be able to create a content template using the classic editor from WP Admin -> Toolset -> Content Templates.
I hope this helps and please let me know if you need any further assistance around this.