AirGap Vault relies on some features that are only broadly available on mobile devices, such as the secure enclave where the encryption key is stored. Desktops don't have the same mechanism available and we did not yet implement a way to store the mnemonic in an encrypted form on disk. So running the Vault desktop is NOT recommended because it is not secure. The only case where it is secure is if you run the Vault on an air-gapped computer. If you are aware of those security issues, then you can run the Vault on desktop as well. We have binaries available on github from the previous version, there is a build issue on the current version that we will fix in the next release: https://github.com/airgap-it/airgap-vault/actions/runs/1247863878
But again, please do NOT run this version on your online computer as it is not safe. It should only be used for testing purposes.