With codeplex gone it can be a bit hard to find the real download for some things. I had to search an old server archive to find this.
Php manager 1.2 x64,
PHPManagerForIIS-1.2.0-x64.msi
This is the original v1.2 64bit download from 2012.
Enjoy.
I also found the older 1.1.1 download should you want that instead,
PHPManagerForIIS-1.1.1-x64.msi
You need the Visual C++ Redistributable
For Php v7.2,
https://aka.ms/vs/15/release/VC_redist.x64.exe The .ms(Microsoft) link looks a bit odd but you can find it on the official site here: https://visualstudio.microsoft.com/downloads/ under other tools and frameworks.
For Php v7.0, v7.1,
https://www.microsoft.com/en-us/download/details.aspx?id=48145
For Php v5.6,
https://www.microsoft.com/en-us/download/details.aspx?id=30679
Enjoy!