For some free packs, you may need to enter "0" or a provided free code if prompted for a purchase key.
Get the free bundles directly from the Free Motion Bro Presets page or specialized repositories like ShareAE . Download File Free Presets for Motion Bro.zip
Locate the extracted folder and select the .mbr file (for v4+) or the folder (for older versions). For some free packs, you may need to