When 64-bit JavelinExecutor.exe is running from its default location "c:\Program Files\Grid-Tools\Javelin\JavelinExecutor.exe", it is able to detect extensions in "C:\ProgramData\CA\JavelinConfig\x64\Extensions".
However when 64-bit JavelinExecutor.exe is running from non-standard location such as "E:\Software\Javelin\JavelinExecutor.exe", it is not able to detect extensions in "C:\ProgramData\CA\JavelinConfig\x64\Extensions".
Release : 4.9.1
Component : CA Test Data Manager
Below tag in Javelin.exe.config and JavelinExecutor.exe.config maintains the location of extensions.
<add key="JavelinProgramDataDirectory" value="E:\ProgramData" />
If you install it on E:\ this extension might have pointed to E:\ProgramData. So, place your extensions to E:\ProgramData\CA\JavelinConfig\x64\Extensions\ or change the path E:\ProgramData to C:\ProgramData in Javelin.exe.config and JavelinExecutor.exe.config file to resolve the issue.
<add key="JavelinProgramDataDirectory" value="C:\ProgramData" />