So just to provide an update:
I asked the seller whether he was actually able to download and authorize Live 8 Suite, He then tried and he said he wasn't able to, so I didn't go through with our transaction.
I received an e-mail from Ableton support, basically saying that they could add the Live 8 Suite license upon request if I purchased an equivalent current license (which would be Live 11 Suite in this case), so... that's what I decided to do