If you’d like to install LightBurn to an alternative location not associated with %ProgramFiles% the “proper” way to do this would be to run the installer from the command like this. I say “proper” because I haven’t seen this documented anywhere official so take it for what it is.
LightBurn-v1.5.01.exe /DIR="C:\DEST_DIR_OF_CHOICE"
However, anytime you do things outside the normal mode of operation the chances of something not working as expected increases as it’s less likely to be tested.