It should be possible to switch back to Podlove Web Player 4. An upgrade to version 5 is not mandatory.
An in-detail guide for Podlove Web Player 5 integration is here: [Tutorial] Podlove Web Player 5 and Podlove Publisher Integration
It should be possible to switch back to Podlove Web Player 4. An upgrade to version 5 is not mandatory.
An in-detail guide for Podlove Web Player 5 integration is here: [Tutorial] Podlove Web Player 5 and Podlove Publisher Integration