Hi there. The one step I don't see mentioned here is that whenever the contents of Mods > Packages changes in any way, but especially when adding, removing, or updating Script Mods like Woohooer, the scriptCache.package file on the top level of your TS3 user game folder should be cleared (deleted). A new cache will form on the next startup of the game.

While you are there though, do a check (right-click, Properties) of the file called DeviceConfig.log on the same level as the caches. Its Modification Date and Time should exactly match the last time you started up the game. If you aren't sure, then check it the next time you start up. If this file is and remains stale, it means you have another game folder somewhere on your system such as in OneDrive that the game is actually reading from instead of the intended one.

And finally, what makes you conclude that Woohooer is not loading? It may or may not show up on a "ScriptMods Found!" pop-up list at startup, but the sure way to check is to see if you have an NRaas > Woohooer menu on City Hall or in-game computers.

Personally I have no use for OneDrive, at least not as an automatic backup or cloud replication system, because I have other tools for these things. So one of the first things I do on any modern Windows system is uninstall OneDrive entirely as it's activated by default. The game being from such an earlier time doesn't expect it to be there and have its own Documents folder get in the way.

But at the very least, if not entirely uninstalled or deactivated, it should be instructed to leave your "real" TS3 user folder alone.