I've purchased Snagit before. My key no longer works. Had to reinstall Windows. Please advise. (Sorry, I don't have the time to search all posts for a solution. I've paid for the program, and I guess I just expect it to work with minimal effort. Thanks for your help.)
Sounds like maybe you had a key for something like version 10 and you have downloaded and installed the latest version and are trying to unlock the latest version with the older key.
If that's the case, you need to purchase an upgrade.
If you need to find an install file for your older version, you need to know what version the key is for, then download the version for the key and all should be well.