*** Warning ***
This process and the attached file is only appropriate for restoring towards XAPI 25.27.0. Use this procedure at your own risk.
We recently put together a solution for a customer that had this exact issue. Below are the basic instructions to update freshly installed 8.3 hosts to the set of updates that were available on October 24th, including XAPI 25.27.0 --
Install XCP-ng 8.3.0 LTS
scp the attached package_list_for_update.txt to the hosts /root. This file contains package versions from our update repository on October 24th.
then, on the hosts, from /root: cat package_list_for_update.txt | xargs yum update-to -y
This will output a lot of messages saying that this or that package is not found. That's expected. Then it will proceed to install the updates. In my tests, 73 of them.
Once the update completes, reboot the host.
Restore the XAPI metadata
Restart XAPI
Verify that XAPI is running.
Install the remaining updates with yum update -y.
Reboot
package_list_for_update.txt