I tried to but it is not playable in dos mode says the program. (DOS BOX Turbo is for android tablets and phones) Even though LSL7 is a supported game in dosbox. Is there any way? Or is GOG's version just coded for windows and there's nothing I can do?

The LSL7 that gog sells is the windows version, not the dos version.

Thanks! That's too bad, I have one from an emu site (since I purchased this one I was gonna try that) but that one don't work either. Guess I'm SOL until ScummVM eventually adds LSL7.

Yes, I have it working from the files in this post http://www.gog.com/forum/leisure_suit_larry_series/lsl_7_dosbox_version