Older version of windows

I keep getting an error message when trying to install ImageAssist on Windows 10 Enterprise 2016 LTSB version 1607.  Error says "Please be aware that this is an older version of Windows and is no longer supported.  Update your image to the latest version to ensure compatibility."  I have updated this image from my last build and ImageAssist ran just fine on the older image but now with all the updates and the updated ImageAssist, it will not run anymore.  I have tried to find an older version of ImageAssist to install on this image so I can capture it without having to upgrade the entire image to Windows 10 Pro.  Any help on this error or finding an older version of ImageAssist?  I am currently running 8.7.1.5.