There's an opnsense ver dependency for installing the intel ucode plugin?? That seems weird.
I clicked the + on the intel ucode plugin and this image pops up.
And where is v25.7.3_4 ?? My "check for updates" only shows the 25.7.3 stuff with a note about the _3 patch.
(https://i.postimg.cc/4NzJTq70/Screenshot-2025-09-10-213151.png)
It's not that weird. The plugins to be installed belong to the last version published.
You can install from the command line if you wish, but to avoid bugs with the plugin and core system out of sync this is the requirement.
Cheers,
Franco