I bought a brand new license for Ableton 12 Suite (not "Intro" or "Standard", this is the 100% full version), but my computer can't run it. Before you purchase, make sure you have a 5th generation Intel® Core™ i5 processor or AMD Ryzen processor (CPU supports AVX2 instruction set).
Included in this license is also Live 11 if you want that for some reason.
Here's some info straight from Ableton about buying a used license:
I'm more than happy to do this step with any potential buyer: "If you are unsure about a secondhand offer, you can ask the seller to contact us with you on CC, to get a confirmation that the license is legitimate."