>>931966
as much as I loathe blendertards, the same thing happened to me (paying for retopoflow) back when I was still using blender and trying to get it up to par.
gumroad has this thing where a seller/creator can make his product free, but still accept donations - it will say "pay 0$+". the retopoflow creators didn't use that, though (at least back then in like 2016) - they just sold it at full price, had a 20 fucking page description and at the very end it would link to "oh yeah if you want it's free btw haha". not using the official feature automatically implies to anyone that is not a fucking robot (who reads EULA-length nonessential garbage?) that they MUST pay. that makes it essentially a scam.