A C7 hub will not offer the 7.22 update at all, what it should be offering you is the 7.18 update which dropped a while back. 7.18 is the recommended zwave radio firmware for a 700 series radio chip.
Ignore everything else everyone has said, they assumed you had a C8 and enabled the new ZWaveJS feature, which then allows the 7.22 update on C8 hubs only.
Please see this info and the linked instructions. You can use the endpoint to confirm your current version before attempting the update. Post the output here if you are not sure how to read it.
