Just a bit of feedback.
Checked SMPlayer on Debian 12 (Bookworm), with the latest revision from the repository, Version: 24.5.0 (revision 10277).
When trying to download subtitles, repeatedly throws the error message:
Also tried SMPlayer via appimage on the same box, with the latest Version 25.6.0. Produces the same error message.
It does seem to run though on previous Debian version. Tested on an older box with a downrev version of SMPlayer 21.10.0 (Revision 10000) running on LMDE (Debian 11 Bullseye). Downloaded the subtitles without a problem.
On a
Windows box (10 LTSC) with SMPlayer Version 24.5.0, downloading subtitle files over multiple attempts, the file contents were empty with the exception of:
1
00:00:00,001 --> 04:00:00,002
Become OpenSubtitles.org VIP member
to get subtitles -> osdb.link/vip
Updated SMPlayer to current Version: 25.6.0 (revision 10369) (64-bit), and all is happy now.
Hope this helps a bit in troubleshooting.