Did you ever fix this?
I suppose this is a version problem, because I can switch to UE 5.3.2 and install HammUEr 2.5 for 5.3.1 without issue.
Why do you think I'm getting "Plugin 'HammUEr' failed to load because module 'HammUEr' could not be loaded. There may be an operating system error or the module may not be properly set up." in UE 5.4.1 with HammUEr 2.5+ for 5.4.1 Spring?