Are you by any chance using a keyboard with French (AZERTY) layout? Sounds like your issue may be a key code mismatch, ‘Z’ on an AZERTY keyboard is ‘W’ on most other keybord layouts, which is what vorpX uses as standard key mapping for forward.
There are three ways to deal with the matter: either changing the forward key mapping in vorpX to āZā OR changing the forward key mapping in the game to āWā OR switching the keyboard layout to English (QWERTY) temporarily.
If you already have the QWERTY layout installed, you should be able to switch to it with WIN+SPACE while on the Windows desktop, otherwise check this link, which explains how to install additional layouts:
https://www.windowscentral.com/how-change-your-keyboard-layout-windows-10.
If that helps, please let me know.