Adding image would downgrade image tools to v.0; disallowed

[Thisistheoldplan]

vyos@vyos:~$ add sys image vyos-1.4-rolling-202312162015-amd64.iso
Validating image checksums
Cleaning up
Unmounting target filesystems
Removing temporary files
Whooops: Adding image would downgrade image tools to v.0; disallowed

I’m getting a strange error with the docker build iso I built using the instructions here:
https://docs.vyos.io/en/latest/contributing/build-vyos.html

i’m running 1.5-rolling-202312101419

[jestabro]

1.5-rolling has a new version of the image install tools; 1.4 does not, yet, although they will be soon backported. Consequently, one can not downgrade by ‘add system image’ — one can ‘add system image’ in a forward direction and the old and new image tools will be interoperable.

So, you can ‘add system image 1.4-version’ from 1.3.x, say, or you can just install 1.4. When 1.4 and 1.5 have parity of image-tools versions, one will not hit that check, however, one will always have the issue of not being able to ‘down-migrate’ the config itself, should you be trying that as well.