VST will not open GUI

[JEL]

I know OBS does not support all VST-plugins, but can anybody say why this VST2 plugin won't work (And what I can possibly do, if anything, to get it to work)?

https://jelstudio.dk/VSTplugin_TestingAndDiagnostics/index.html

It's a free plugin that works in Reaper and Audacity.

Thanks
jacob.