you own a neXt v1.x license and have probably overlooked the update note on the download page for the v2.x.
After 9 years with many free v1.x updates, we have updated to version 2. You can upgrade your v1.x to v2.x license at an additional cost. Or of course reinstall the old version. The update link and the previous version can be found here: dl.next-sim.eu
It's not just a minor update. With a v2.x license you will continue to receive the monthly updates.
I guess you are on OSX. Then you have to go to the Programs folder and start the CGM-RC-Flight-Simulator there.
Please notice: Under OSX they have to be copied from 'Macintosh HD/Users/ user name /Library/Containers/com.Eiperle-CGM.CGM-rc-Heli-Simulator/Data/neXt/prefs.ini' to 'Macintosh HD/Users/ user name /Library/Containers/com.Eiperle-CGM.CGM-RC-Flight-Simulator/Data/neXt/prefs.ini'.