Whenever you open Q, the program checks that the computer on which it is being used is the same as the computer on which it was previously used. If Q detects a hardware change, you will get an error message saying that the license has stopped working because the computer has changed substantially.
There are two situations when this message will appear:
- If you have moved the license from one computer to another in an unauthorized way.
- If you have made substantial changes to your computer (e.g., modifying its hardware or operating system), in such a way that it looks like a new computer to Q (i.e., a false positive). This can also sometimes occur after Windows updates have been applied to your machine.
To resolve this issue, send an email to Q support for assistance, providing as much detail as possible so that we can work out the likely cause and find an appropriate solution.