[Uzin]

Mine doesn't work either with custom install, it keeps crashing and getting error messages as soon as the plane loads.

Well, my experience so far.
I tried the program successfully with my HSFX4.1 install with SAS modact, when :
1) I backuped the original file DeviceLink.txt by renaming it DeviceLink_orig.txt
2) pasted the file DeviceLink.txt which is inside the RHUD BETA 1 folder.
3) copied the whole folder RHUD BETA 1 into the MODS folder of HSFX4.1
4) after double clicking on HUD BETA.exe file, run HSFX4.1 in DirectX mode.
5) run QMB any plane, it appears with HUD.
I do not know if all the steps are necessary, but this is the way it works.

When the same steps were done with my 4.09m install with SAS modact, Il2 runs well but without the hud, even with DirectX. I do not know the reason. UP2.01 was not tried yet.
Write to the author of the RHUD BETA 1 program, please.