Installing on opensuse

Hello, I am trying to install opensuse rpm, using Yast, onto Leap 15.4. I've tried downloading three times, even though the SHA256 hash matches, but I see an error:

Error: INVALID:rstudio-2022.12.0+353-1.x86_64 (file-6dbe58d6): Signature verification failed [4-Signatures public key is not available]
    Header V4 RSA/SHA256 Signature, key ID 3f32ee77e331692f: NOKEY
    Header SHA256 digest: OK
    Header SHA1 digest: OK
    Payload SHA256 digest: OK
    V4 RSA/SHA256 Signature, key ID 3f32ee77e331692f: NOKEY
    MD5 digest: OK

I wonder if I am doing something wrong? I guess it is expecting to be installed from a repository but there does not seem to be one that I can find
Thanks
Dave

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