OpenHAB 2.4.0 - install openHAB Cloud Connector

Thanks. The only problem - it downloads .mid file. Is it just extension change?

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Oh come on, you’re a professional. Need to be told?
Falling in this hole makes you unlucky, not an idiot.

That didn’t happen. It did happen all in a rush, could have been better planned, but a conscious decision was made to limit replacement provision to last OH2 version.
The decision was to your disadvantage.
“You didn’t complain at the time!” would be just as silly a position for everyone else to take.

Again, your 2.4 installation is not out of service or at risk of total loss - you do take backups, right?
Your problem is that you now wish to change it, enhance it.

It is what it is, you’ve a number of paths forward from here.

You sure you don’t mean yourself in this pic ?

Yes I think so, Maven Central probably uses the wrong headers which may cause it to be mistaken for a MIDI file:

Screenshot from 2021-06-23 19-25-23

But it should be big and have the right checksum:

$ ls -l openhab-addons-2.4.0.kar 
-rw-rw-r-- 1 wouter wouter 182006216 jun 23 19:23 openhab-addons-2.4.0.kar
$ md5sum openhab-addons-2.4.0.kar 
29adf1c65d886c11534d91e9178aa6a0  openhab-addons-2.4.0.kar