Download the official trial version from Hamrick Software Download Page. The trial allows you to test scanner compatibility and features completely free, though it adds a watermark to saved images.
Found it! For anyone in the same boat, just go to the official website and use the "Lost License Key" retrieval. You just need your email. Don't bother with keygens – those are full of malware. VueScan is cheap enough for a lifetime license anyway. vuescan serial
A legitimate VueScan license allows a single user to use the software on up to four different computers, across Windows, macOS, and Linux, without needing separate serial numbers. Download the official trial version from Hamrick Software
