Adding languages in Trados Studio 2017

Dear all,

I have a licensed Trados Studio 2017 Freelance version. I cannot use my Trados Studio 2017 since 2020, as I tried to delete the program on my computer and reinstall it. When I come to the step adding 5 languages, it always shows such an error screen "Ссылка на строку не ссылается на экземпляр String.Имя параметра: s". I tried to solve this issue by resetting my valid license, but it didn't work.

Is there any way out of this situation?

Regards,

Gulnar