If you want to downgrade back to BeyondPod 3.X, just un-install the current 4.0 version and then install the latest 3.X public release: 3.3.68 PHONE or 3.30.68 TABLET.

IMPORTANT! If your device runs Android KitKat AND you have moved the episode download folder to the External SD card, all your downloaded episodes will be deleted when you un-install. If you want to keep your episodes, you have to move them back to the internal SD card BEFORE doing the steps above. Alternatively you can copy the BeyondPod download folder ([Path to Your External SD card]/Android/data/mobi.beyondpod/files/BeyondPod) to your PC/DropBox/Google Drive etc.)