PHP Manager - Downloaded file failed signature verification

After watching this video "How To Install PHP Manager On Windows Server 2016 And Windows 10" https://www.youtube.com/watch?v=_-4klYZi-CM

I was able to deduce the filename of an MSI file which gave me more options to search by.

I found a GitHub site https://github.com/edgardo001/PHPManagerForIIS-Versiones which contains install files for versions

• PHPManagerForIIS-1.2.0-x64 - IIS 7.msi
• PHPManagerForIIS-1.2.0-x86 - IIS 7.msi
• PHPManagerForIIS-1.3.0-x64 - IIS 8.msi
• PHPManagerForIIS-1.4.0-x64 - IIS 10.msi

I was able to successfully install 1.4 (x64)

Installing PHPManagerForIIS-1.3.0-x64 - IIS 8.msi as suggested by @MrSlim worked for me since i had IIS 8 running