right click on leage in lutris, “run exe inside wine prefix”, select the installer file.
or if you need to mess with stuff in it from terminal, right click on leage in lutris, “configure”, then on the “game options” tab you see the wineprefix’s location, then do:
# then whatever you want to do on terminal
# when you're done:
but to get the wine version and everything right it’s preferable to just use the “run exe inside wine prefix” option.