Community Edition Invalid License & Application Close!

I just installed VP Community Edition 8.1, and just downloaded License key via request key button & it sent me the keys named “vpsuite.vplz”.

But afer i tried to run the application , it was said “Your license key are invalid & application will now closed” …
what happenned ? I can’t understand what is wrong with this . Everythings seems ok. ( License key valid & application installed succesfully )

I have been trying uninstall & install again, it still can’t recognized the key.

can somebody help me ? thanks …