Some customers are reporting problems when trying to install TempIT of Windows 7 SP1
The problem might be caused by the security signing we use on our software. To make sure the files installed on your computer have not been modified or altered, we electronically sign the install file with what is call SHA-2 security. By default Windows 7 supports SHA-1 but not SHA-2 so this is what is causing the problem.
There is a Microsoft support page that mentions the problem: https://support.microsoft.com/en-gb/help/4472027/2019-sha-2-code-signing-support-requirement-for-windows-and-wsus
Please install the security updates mentioned on the Microsoft site.