Solved! Go to Solution.
I read in community that Turkish Windows OS may be a cause for this error.
I changed my Windows OS language from Turkish to Russian. It works.
See here, for a (potential !) solution: https://community.ptc.com/t5/Mathcad-Installation/Error-quot-An-Unhandled-exception-occurred-on-the-dispatcher/m-p/706410#M19
Some causes for this error are known and fixed.
Some causes for this error are known and intended to be fixed in Prime 9, be patient until March 2023.
Some causes for this error are yet unknown..After all, the error is an unhandled exception...
Success!
Luc
I read in community that Turkish Windows OS may be a cause for this error.
I changed my Windows OS language from Turkish to Russian. It works.