However, I encountered a 404 error and was unable to complete the download. This issue did not occur last month, and I was able to download the box without any problems. Could anyone provide any information or assistance regarding this issue? I apologize if this is not the appropriate place to ask.
That is because Rocky 9.5 is the latest version now, Rocky 9.4 has moved to the Vault. You can edit the URLs in your /etc/yum.repos.d/*.repo files to point to the vault but this is not a supported configuration.
The only supported versions are the latest, eg Rocky 8.10 and Rocky 9.5. There is no version pinning or downgrading of packages like with RHEL.
The primary issue is that the vagrant pages have not been updated for 9.5, which Release Engineering has a hand in. They will be updated sometime today/this week by @neil which will point to 9.5.
In the meantime, newer vagrant images can be found here until then.
If, however, you need the older version, then yes, you will need to download from the 9.4 vault.
Note that the rockylinux/8 Vagrant box is also returning 404 right now. If possible please avoid dropping the old images before the links are updated as it will affect users that only pin the major version.
WORKAROUND
Avoid using official box for now and use generic/rocky8, note that I am not affiliate with the box publisher and cannot guarantee its credibility.