In my case download works over mobile data only, but don’t work on wifi.
Edit: v9.1.0.31720 works fine again.
Edit2: v9.1.0.31720 only works with mobile data and in remote wifi, but not in local wifi.
04-02 16:45:32.967 e: [DefaultDownloader] Exception downloading /data/user/0/com.plexapp.android/Plex Media Server/Sync/2/3/.grab/c0cfa02d7afe9b5414cdb45b9fc1c0105436d5bb-local/The Kid - Image ist alles (2000).mkv
04-02 16:45:32.968 i: [DownloadQueueManager] Download failed: c0cfa02d7afe9b5414cdb45b9fc1c0105436d5bb
04-02 16:45:32.968 e: An exception occurred: java.io.IOException: Unsuccessful response: 0
04-02 16:45:32.968 e: Stacktrace: java.io.IOException: Unsuccessful response: 0
at com.plexapp.plex.mediaprovider.podcasts.offline.b.f(SourceFile:27)
at com.plexapp.plex.mediaprovider.podcasts.offline.b.e(SourceFile:1)
at com.plexapp.plex.mediaprovider.podcasts.offline.b$a.invokeSuspend(SourceFile:2)
at kotlin.coroutines.jvm.internal.a.resumeWith(SourceFile:4)
at kotlinx.coroutines.f1.run(SourceFile:22)
at kotlinx.coroutines.internal.o.run(SourceFile:2)
at kotlinx.coroutines.scheduling.k.run(SourceFile:1)
at kotlinx.coroutines.scheduling.a.l(SourceFile:1)
at kotlinx.coroutines.scheduling.a$c.d(SourceFile:4)
at kotlinx.coroutines.scheduling.a$c.n(SourceFile:4)
at kotlinx.coroutines.scheduling.a$c.run(SourceFile:1)
04-02 16:45:33.370 i: [HttpServer] /127.0.0.1:43638 - GET /media/subscriptions
04-02 16:45:35.974 i: [DownloadQueueManager] Network conditions are fine, download really failed
04-02 16:45:35.975 w: [DownloadQueueManager] Adding c0cfa02d7afe9b5414cdb45b9fc1c0105436d5bb to the failed list: Unknown issue occurred.
04-02 16:45:35.975 i: [DownloadQueueManager] Current download queue is empty and there is content that failed
04-02 16:45:35.975 i: [DownloadNotificationManager] Displaying error notification (Einige Elemente konnten nicht heruntergeladen werden).
04-02 16:45:35.982 i: [DownloadServiceHandler] Switching to 'waiting for downloads' after download queue finished
04-02 16:45:35.983 i: [DownloadServiceHandler] New state is WaitingForDownloads
04-02 16:45:35.983 i: [DownloadServiceHandler] Waiting for downloads (reason: switched to 'waiting for downloads' state with no pending grabs)