Is there a way to install Safing Portmaster on Fedora SIlvernlue 38?

Hi,
I’ve just installed silverblue so i’m still new to it, how can i install a firewall like portmaster?

When i launch the command ’ rpm-ostree install portmaster-installer.rpm’ i get the following Transaction in progress: new-deployment

You can cancel the current transaction with rpm-ostree cancel then when i launch ‘rpm-ostree cancel’ i get ‘‘Cancelling transaction: new-deployment’’, after that i cannot launch any commands anymore.
What should i do/look for?
thanks for any suggestions

See:

The “transaction in progress” message that you have is because GNOME Software was likely updating the system in the background when you tried to install the package.

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