Thanks for reaching out the helping hand and... for offering this fine piece of software! (same @ Andre for the SimShaker Sound Module of course!)
The "SimShaker Sound Module" shortcut in the C:\Users\<my user>\Documents\SimShaker for Aviators you mean?
Funny thing is that I tried it some times again, uninstalling and reinstalling SimShaker for Aviators and subsequently SimShaker Sound Module. At last attempt - before re-installing SimShaker Sound Module - doing an uninstall of MicroSoft OneDrive.
I suddenly recalled that some months ago when I first installed the SimShaker Sound Module software, I had issues with files being installed just on MicroSoft OneDrive and not locally. I back then simply unlinked MicroSoft OneDrive and then it worked, but somehow OneDrive was automatically linked to my Windows account again recently.
This OneDrive issue came back into mind when I noticed that after having uninstalled SimShaker for Aviators and SImShaker Sound Module, then doing a re-install of SImShaker for Aviators it somehow still knew my preference was to use the SimShaker Sound Module. Launching the freshly (?) installed Simshaker for Aviators while not having reinstalled SimShaker Sound Module produced the exact same exception. Just pressing the 'continue' button and then looking at settings showed that the preference for SimShaker Sound Module was somehow already selected. But I had not reinstalled the Sound Module yet, nor explicitly re-set it to this setting after the ' fresh' install of Simshaker for Aviators.
Having uninstalled Microsoft OneDrive and then reinstalling SimShaker Sound Module solved the issue for me. With previous re-installs the SimShaker Sound Module lnk was probably on OneDrive and not local machine.