If you have your M-Tron Pro patches saved as a .mtron file, do this:

1. Find the saved patch file which should be here: Mac: ~/Library/Application Support/GForce/M-Tron Pro/Patches  Win: Documents\GForce\M-Tron Pro\Patches
2. Move it to the M-Tron Pro IV user patch location. Default is: Mac: ~/Library/Audio/Presets/GForce/M-Tron Pro IV  Win: Documents\GForce\M-Tron Pro IV\User Patches
3. Open the Patch Browser in M-Tron Pro IV and click the refresh icon (two cycling arrows)
4. M-Tron Pro IV will now find the presets and offer to convert them. Say yes.
5. Delete the .mtron files from the user patches folder.

On Mac, if you have your M-Tron Pro patches saved as a .aupreset file, you can do the same as above. But those patches will be initially found here: ~/Library/Audio/Presets/GForce/M-Tron Pro