Many posting talking about similar things.
On Linux, first thing to try is
/opt/vdhcoapp/vdhcoapp install
If that doesn't work, you should review all at
https://github.com/aclap-dev/video-downloadhelper/wiki/CoApp-not-recognized
If all else fails, remove the package "completely" ... then reinstall. To be on the safe side, always end by running the command given above to "close off the issue".
If that all works, please reply to the Group that your issue is
closed.
If it still fails, you will have to wait for a developper to respond.
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