Crash to desktop after fs2020 installation

Good morning all and happy Monday.

Yesterday I have decided to install 2020 back since I don’t like photogrammetry artefacts that 2024 is presenting so far.
I want to keep both sims as many of you do.
Unfortunately once the installation has done, FS2020 crashes to desktop during startup.

I went to take a look to the folder structure and it is kind of wired. I created a separate folder for fs2020 and now my fs2024 folder that was already there is gone. Just the fs 2020 folder is there.
In it I can see the licenses of both sims.
Then in the wpsystem folder( another folder generated by the installation, outside of the one created by me which was FS2020) I have both sims community folders.
msfs-2020 msfs-2024
Any hints?
Thanks

Nvidia GPU? If yes …
FYI, with Nvidia driver 572.16/572.42/47/60,70,83 Nvidia app and DX12 selected in MSFS 2020 a CTD won’t occur.

However, with DX11 selected in MSFS 2020, using the same latest Nvidia driver and Nvidia app, a CTD will occur.

Until Nvidia fixes the application and Asobo MSFS 2020/2024, please check what happens if you select DX12 instead of DX11 by manually editing cfg file.

To do this, you need to edit usercfg.opt file and modify the line
PreferD3D12 0

Change the number 0 to 1

and save the changes.


OR

If you need Nvidia app, make sure to select DX12 instead of DX11 in Nvidia app and the profile for MSFS 2020.
// optimize MSFS 2020


OR

If Nvidia app installed go to:
c:\ProgramData\NVIDIA
delete folder named NGX

Source
https://forums.flightsimulator.com/t/crash-after-reinstall/708440/4?u=tenpatrol