The filename itself tells a story. Let's parse it:
If you just want two-finger swipe back/forward, save yourself. BTT is for people who think, “I wish I could…” and then make it happen. BetterTouchTool-4.010.dmg
The "4" in BetterTouchTool-4.010.dmg is the most critical part of this identifier. BetterTouchTool has evolved significantly over the last decade. The transition to version 4 represented a massive modernization effort by the developer, Andreas Hegenberg. The filename itself tells a story