If you receive an “Unknown error” or “Invalid code”, please check to ensure that your activation code is entered correctly. The name does not matter, only the code.
Contact us and we’ll check your license.
Check that your internet connection is working. Try accessing https://activate.bitsum.com through a web browser.
In some cases, we’ve seen the system HOSTS file modified by prior use of a software crack (piracy) that prevents connection to our servers. Correct it by this guidance.
Since some problems could be temporary, so you may want to simply try again later.
Contact us if you have continued troubles or questions.