When I configure the computer to the latest version of Fedora 39 and update the rpm-ostree I get the Chromium version 128. But i would like to install the version 125. How would i go about this. I tried to install it manually via the koji page the rpm but it has not worked.
Any suggestions? Thanks 
This is not an answer to your question, but can you elaborate why you want to install an old version of Chromium? Are there things in newer versions that don’t work well for you?
Please also be aware that F39 will be end of life in about 6 weeks from now and will not receive any further (security) updates after that.
Added chromium
We are attempting to solve an issue in a software we developed. When we tested on the version 125 it worked and not on 128 occasionally it does not work.
As flatpak, you can find the relevant commit:
flatpak remote-info --log flathub org.chromium.Chromium
Then update to the chosen commit, e.g.
sudo flatpak update --commit=263577bf1ca57d7582e4a19a61b5f18976589823bb4e9b3d88fa488eeac8d564 org.chromium.Chromium