Standalone vaults in 1Password 8

Are standalone vaults supported in 1Password 8?

No.

Can you import standalone vaults from 1Password 7 without signing up for the online service?

No.

Can you create new standalone vaults in 1Password 8?

No.

Standalone vaults and usage without a 1Password membership are not supported. https://1password.community/discussion/comment/601917/#Comment_601917 is AB's official answer.