I’m not particularly fond of paying for books which have been around for centuries, translations or no, so ‘free version’ is kind of what i’d prefer for the Quran.
Unfortunately most of the free versions i’ve found (e.g. on Manybooks) have a whole host of comments degrading them as poor translations. The exception is Three Translations of the Koran, which seems universally ignored by People Who Read The Quran. (Also the EXACT copy i downloaded is not precisely the one on Goodreads and apparently i’ve become enough of a Goodreads fan for this to be an important consideration.)
In the end i’ll probably just suck it up and buy The Holy Qur’an in Today’s English. Having three translations together sounds cool but one is quite enough for me, especially as i don’t exactly plan to convert any time soon.