MultiTerm script error when trying to add or edit a term manually

I have the same problem that has been discussed here in several threads, but I don't seem to have CU 5, so I can't revert to it.
I completely uninstalled MT, and reinstalled the July 2017 version. MultiTerm did not work at all without the updates. so I had to install them and the term editing/adding error came back.
Where can I find MultiTerm CU 5?.
Thank you for your help,
Sandra