Hello,
I still have an older opnsense version 20.7. To upgrade to 24 I need a mirror with the old versions. Does anyone have a link for me? Unfortunately I couldn't find anything in the forum or on the internet.
Try to reinstall with a later version and import the configuration.
The primary repo (pkg.opnsense.org) still has 20.7 (and even older versions).
Cheers
Maurice