I've pushed a fix onto the original GitHub for those KB updated. Since @Unantastbar has updated to 1.7.0.16, they should hopefully see the fix in frmAllInOne.cs (lines 5473 to 5491).
https://github.com/Legolash2o/WinToolkit_v1
It's been a while but when installing fonts, I think items also get added to the Windows registry.
Alternatively, you could create a script that runs at first boot that silently installs the fonts.
The source code for WinToolkit v2 can be found below:
WinToolkit v2: https://github.com/Legolash2o/WinToolkit_v2
The topic for WTK v1 source code can be found here.
The source code for WinToolkit can be found below:
WinToolkit v1: https://github.com/Legolash2o/WinToolkit_v1
Sorry for the rubbish code for v1. It was written when I first start C# and did not fully know about proper object oriented programming.
The topic for WTK v2 source code can be found here.