On the steam page, https://steamcommunity.com/app/1207050?snr=2_groupannouncements_detail_, VUP said this:
VUP Official [author] May 12 @ 3:47am
I remember the Leap Motion driver for Vseeface is Gemini v5?
But VUP has not upgraded the driver, and still uses the old driver (that is, the driver provided in this tutorial)
If you want Leap Motion to work in VUP, please use the driver from this tutorial
And please uninstall the latest driver(Gemini v5) before installing the older driver
Oh... sorry .. the driver link in this tutorial is blocked by steam
But I put it on pinned comment of this video
(Apparently this is the old driver)
https://course-1259765984.file.myqcloud.com/%E7%AC%AC%E4%B8%89%E6%96%B9%E6%8F%92%E4%BB%B6/leap_motion_developer_kit_4.0.0%2B52173.zip
Now I need to figure out how to uninstall Gemini v5 and install this old one