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VersionUtility 2017.1 installation failed on VisualStudio 2015 & 2017

during the installation of VersionUtility 2017.1 i get error message - Microsoft Visual Studio: Unknown Error

log file:

Error 1722. There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor. Action VS2017DevSetup, location: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\, command: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\devenv.exe /setup /nosetupvstemplates
=== Logging stopped: 2017-07-30 16:24:46 ===

what could be wrong? i'm running Windows 7 Pro 64bit, have installed both VS2015 Pro and VS2017 Pro. both IDEs looks fine, i can code and compile with them.

other parts (WinForms, ASP.NET, WPF, etc...) installed without problems. the only problem is with VersionUtility. 

VS2017 is fresh installed, one week ago. VS2015 is older and have VersionUtility 2013.1 and 2016.1 installed.

thanks for any help!