Add skip-lost argument to solve issue #3 #5
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Try to solve #3 (more information here)
How to run:
./sponsrdump.py $OTHER_ARGS --skip-lost
Tested on my NAS with these changes:

Run with:
./sponsrdump.py "https://sponsr.ru/uzhukoffa_lessons/" --prefer-video 1280x720 --skip-lost