CentOS8 to AlmaLinux8 Offline Migration

I have a CentOS 8.5 server that I wish to migrate but it is in an air gapped network. It has been patched to the latest 8.5 updates but I only see the migration script to get everything online. I did used rsync with a mirror to download everything AlmaLinux8 on an external drive which I used for all my Linux Servers but I cant seem to point the migration script to the local repository instead of the internet. Is there an offline migration tool, script that I can use to migrate this air gapped server using my usb drive?

Hi there! You should be able to follow this guide to get it upgraded. Let us know if you hit any problems! ELevate Offline Guide | AlmaLinux Wiki