Activated licence got deactivated, Freelance entered into trial mode.

I purchased Freelance 2021 subscription for one year one month ago. After some days, the program closed itself due to a software error and when restarting it, it entered in test mode, thus my regisstration was lost.

I need you to provide me an exact guide, maybe by chat, to reactivate the program, There are 4 days of trial left, and I need to keep on working.