Note to developer: You don't suggest downloading the game, you make it mandatory to continue, that's not quite the same.
Also, not everybody uses Windows.
I just did it as I went on, with all 3 materials at the same time (they used to all drop everywhere.) it was a bit tedious at first I think i got the 5k gold bag slot around lvl 60.
@dubesor but vanish also allows you to lower the % of HP at which you rest, thus making you resting less often as well. It's not the best skill but it helps. I'm 15 levels from reaching 80 anyways so i don't care so much anymore, monsters drop pretty fast with ambush and high agi, and the 20% extra xp is welcome especially when you consider the very small xp you get per monster (currently 0.08-9% per monster with the 20% extra)
@dubesor Thief tree is actually good for leveling, you get 20% extra xp and vanish to make you go rest instead of dying(saves time). so investing 25 points in this tree isn't bad, and you can reset your points when you get to 80.