Product Key suddenly doesn't work

Goodmorning,

I have had this problem for about 1 week now, at first i tought it might've been a license server problem but now I'm not so sure anymore...

My Start10 suddenly stopped working and tells me to enter a product code, however whenever I do so it gives a "Unable to activate Start10. Please try again or contact support. (Error code: -205).

I have tried to reinstall two times now but still no result. Whenever I try the 30 day trial option it still gives the same error. 

Does anyone know how to fix this problem?