Update 7.16.2 to 7.18.2 from file not work

I would like to update our cAP ax units and switches from 7.16.2 to 7.18.2. Have done some by auto update so far but now I get 7.19. Want to keep the system on the same version
Tried to download 7.18.2.npk (Arm64) to the files and reboot but it does not work. The cAP just reboots but stays on 7.16.2
Any ideas? Low disk space?

make sure remove other packages except for routeros and perform upgrade

Anything in the logging?

As others have suggested, the logs usually (in my experience always) specify why the upgrade has failed. Read it.

When doing a manual upgrade, it will only succeed if all of the installed packages are available for update. If you upload additional packages, those will be installed as well. You can see what packages are installed in system->packages. Be sure to only look at installed and not disabled ones.

If you simply want to upgrade, copy the packages above, and only those to the system. For switches this usually means only the routeros package, for the cap ax the routeros package + wifi-qcom.

(Sometimes when upgrades from below 7.13 were applied, the switches also have a wifi or wireless package installed. I would disable them before upgrading - they do nothing on devices with no wifi interfaces.)

I would not follow the suggestion to uninstall the wifi package on the cap ax units - the wifi won’t work anymore.

Thanks
Had to remove the WiFi to update. After that I installed the wifi qcom separately and it all seem to work.
2 packages in the cAPax Router OS and wifi qcom.