Attempting to generate modules within Gen 8.6 and get the error:
"CA Gen Build Tool Compose
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Exception caught: java.lang.RuntimeException:*** OPT.VSVERSION contains an unknown value () or the specified Visual Studio compiler is not installed.
Release : 8.6
Component : Gen Workstation Toolset and Build Tool
Gen 8.6 Build Tool OPT.VSVERSION Visual Studio 2017 & 2019
Per the above article:
To provide VS 2017 support Gen 8.6 Complete PTF WKS86200/SO09618 should be installed.
To provide VS 2019 support additional PTFs TSN86209/SS13873, BTN86201/SS13871, RTN86208/SS13872 should be installed.
The VS 2017 support was originally delivered with a series of *861* PTFs but WKS86200 supersedes them.
WKS86200 is also the baseline for all new 8.6 PTFs, so it should be installed as a matter of course, to be able to install any later PTFs.
Gen™ 8.6 > Technical Requirements > Change Summary