This downloader is very promising and very fast!
Succesfully tested with DASH and HLS videos.

Request for a new version:
Dash: Select quality for both video and audio and after download merge them in one mp4 (now you can download video and audio separately)
Hls: Convert ts to mp4
Dash, Hls: when converting to mp4, Fixup MPEG-TS in MP4 container (like ffmpeg does)

thanks

Reply for version 4.0.0
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Thank you for your quick response!
HLS is successfully downloaded as mp4
Dash quality selector is working but i get next errors:

a) 1080p · 4.0 Mbps
Media Downloader Pro
✓
The Kid Ε2_1080p.mp4
1 min ago · 1.22 GB · too large to merge in the browser — the audio track was not combined

b) all other qualities (720, 432, 360, ...)
Media Downloader Pro
⚠
1080p · 3.0 Mbps
1 min ago · Unrecognised container — expected MPEG-TS or fragmented MP4

for version 4.1.1
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This version is fully functional for DASH and HLS videos!!!
I believe you have more surprises for the future. We remain here waiting.
Thanks a lot for your fantastic work.