Since OM is not fedora, dependency package naming is going to be different. You might already have the needed libraries but some RPM packages check for specifically named packages containing the libraries rather than the required files directly
Try “rpm -i --force --nodeps MullvadVPN-2025.4_x86_64.rpm”, that’ll force install it
Just a disclaimer, very rarely removing packages installed this way (especially those with more complex post-install scripts) might be problematic but so far I haven’t had issues yet