The original issue of the original thread, is exactly like my issue here, and was stated as follows:
I had originally replied to that post in the original thread, indicating I was having the same problem, and inquiring about any solutions to said problem. My inquiry never saw the light of day over there, so hopefully it will here.bookbear wrote:I have a problem with UNinstalling Light... it simply will NOT uninstall, keeps giving an error message saying that the uninstaller is not valid. The original installation files were downloaded from SourceForge directly. I am running Win10, no viruses or malware, and everything else is functioning properly. I can't even copy and paste the error message, but it starts with "Installer Integrity Check Has Failed."
Thanks in advance for any advice on how to uninstall Firefox Light!