Don't. Just don't. G502 HERO firmware update through G HUB is broken. Waited for over 1.5h with the mouse "updating" and not working, and at the end had to disconnect and reconnect
Logitech G502 Proteus Core Review
Logitech releases 25,600 DPI software update for several HERO gaming mice | TechSpot
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False Positive: Logitech G502 EXE file | Webroot Community
Logitech G502 Software Update, Drivers, Manual and Review (Wired)
Logitech G Owners and Discussion | Page 76 | OCAU Forums
How to update your mouse firmware (logitech G502) - YouTube