Update to OSMC 8.0.4 from 6.0.3 Rpi2 - Stuck add-on migration in progress

Upon update, Kodi is stuck trying to migrate add-ons - similar problem to:

However, neither of those thread diagnose the problem.

Inspecting the log file .kodi/temp/kodi.log reveals MD5 mismatch errors as follows

19:36:54.622 T:1716515744 ERROR: CAddonInstallJob[resource.language.nl_nl]: MD5 mismatch after download. Expected eaed56a08372dd69fe41bc4c4d907efe, was
19:36:59.751 T:1716515744 ERROR: CAddonInstallJob[resource.language.ro_ro]: MD5 mismatch after download. Expected 11eb5b76fc1b3ed38dc5af4afd431b69, was
19:37:01.369 T:1716515744 ERROR: CAddonInstallJob[resource.language.szl]: MD5 mismatch after download. Expected cedb1d29dd3bcbf7956289af10f1b177, was
19:37:14.384 T:1641018272 ERROR: CAddonInstallJob[resource.language.hi_in]: MD5 mismatch after download. Expected b978f143e34f004ed6b463dd0138bb5b, was
19:37:21.525 T:1674572704 ERROR: CAddonInstallJob[resource.language.mn_mn]: MD5 mismatch after download. Expected f65b25f8e2fbfa37f51850607212c0f5, was

Note that the log file doesn’t have an MD5 entry for the downloaded file. Does this suggest a problem downloading or checking the checksum?

However, both network access and md5sum seem to be working normally

Any other ideas?

Upon restarting kodi, it boots ok

8.0.4 and 6.0.3 are not recognised OSMC versions.
Are you sure you’re not using something like OpenELEC?