Apologies if this has been covered...
Like many downloading the new CFM and trying to open it has been a real pain.....looking for solutions here and CN had some useful guides but like am sure for some proved no use.
Anyway I found this site https://windowsreport.com/jar-files-not-opening-windows-10/
And basically skipping down to solution 3 clicked the link and downloaded Jarfix - now it comes up real quick as a splash and its gone again...I thought not again. However when you now click on your extracted download for CFM it now opens.....happy days can now fix the GPS bug and updated some stuff which is annoying the heck out of me and I will now be ready for 2022 (our next clear night)
Space Bat