I see that we have at least 3 issues here.
Our process is always to handle one issue each Ticket in the support forum
Hence, we will handle here the issue with the Toolset Forms, which you need to submit twice, to have them submitting for real.
I cannot replicate such a scenario, this seems to be bound to some AJAX forms I guessed, but even there I can submit the forms fine.
Can you outline precisely how to set up the form so to have that issue appearing?
Then we can fix it.
If there are no clear steps, please add a copy of your (slimmed down, if possible) site, and explain where we can see that issue.
It is helpful if the copy is of a site where you already disabled other plugins, themes and custom code, so the issue is "narrowed down" to the actual problem form, page and post, nothing else if possible.
Then we can analyze this and eventually fix it.
Of course, we can as well work with larger or more complex copies of websites, in case you have no possibility to provide a slimmed version of it.
https://toolset.com/faq/provide-supporters-copy-site/
Related to the other 2 problems you report:
1. I also have some new unexpected ";" error from the functions file which was introduced after the update.
Toolset Updates do not modify the functions.php File of the theme, hence it cannot be that the issue is due to Toolset, but maybe I misunderstand you.
To handle this, please enable WP Debug and look what the error is (unexpected ; at line... or similar?)
Then head to the code line in question and correct that code if it's in your theme (would not be related to Toolset)
If the error points to a Toolset File let us know in a new ticket (I cannot split first replies, otherwise I would create one for you)
2. In the process of update I also had some issues with not being able to connect to the validation server that checks for the license code.
There are several known issues here.
First, Views will continue to tell you it's not registered even if it is.
Second, there may be some issues with the server (that was yesterday) that resulted in packages not found on download.
In any case Toolset works as well when you do not register it, but if you feel there is an issue not described above, please as well add a new ticket which we can handle
About access details, if you can give us the Duplicate, for the problems that require it, that would be great because debugging online is somewhat difficult (we cannot run debug tools remotely, and we need to see what happens in the code while performing the actions you describe)
Thanks!