Can't get VST2 to show up

I have two PCs on the RTO program. On one computer, it works perfectly, I can see the VST2 and the VST3. But on my other computer, I can only see the VST3. If I copy over the Serum_x64.dll then that shows up as a VST2. But this makes it incompatible with any older projects.

Any help would be appreciated. It makes it very difficult to switch back and forth between computers.

Look in Live Preferences->Plug-ins for the VST2 Custom Folder. This cannot be your VST3 folder.
Make sure Serum_x64.dll is in this same folder (and similar to the above, not also) in the VST3 folder.
Alt-click the rescan button in Live Preferences->Plug-ins.