My plugins are appearing in After Effects, but not Premiere

First check that these two factors are accounted for:

• The plugins you're looking for are compatible with both Premiere & After Effects.
• You have a GPU that's got at least 4GB of VRAM per monitor

Once that's been done, you can follow either of these two sets of steps to try and remedy this behavior:

Option 1:

1. Launch Premiere
2. Head into the Effect or Effect Controls window (which can be enabled from the Window menu if not currently visible)
3. Select the menu button > Manage Video Effects
   
4. Enable the missing effects.

Option 2 (Windows only)

1. Close Premiere & After Effects
2. From the Start menu, search for regedit and launch it to open the Registry Editor
   • As a precautionary measure, consider backing up your Registry by selecting File > Export and save all of the Registry to someplace accessible
3. Within the Registry Editor, head to \HKEY_CURRENT_USER\Software\Adobe\Premiere Pro\<version number>\PluginCache.64\en_US 
4. Here you'll see folders showing plugins on the left, and-- when they're clicked-- you'll see a few columns with Name, Type, and Data set on the right.
5. Click the plugins that are not loading from the left side.
6. On the right, you'll see a section labeled Ignore
7. For each of these plugins, if Ignore is set to 1, set it to 0
8. After that's done, close the Registry Editor and relaunch Premiere