There are two versions of Polarr filters. You can separate them by their appearance of the QR code filter.
In the old version, the preview images are arranged left to right.
While the new version has the images arranged inside and outside. (Shaped like a leaf)
At present, the old filter QR code cannot be generated in the application, but we still allow the old filter to be imported in the latest Polarr. The new version filter cannot be imported in the old applications (5.x and before).