The restore button keeps being disabled if:
- You did not provide a wallet name.
- You did not provide a spending password.
- You did not give the repetition of the spending password or they do not match.
- You did not give as many seed words as you specified in the step before that.
- The checksum of the seed phrase is not okay (meaning you chose a wrong word in some position).
- Surprisingly often: You put all seed words in the field for the first one separated by spaces. You have to acknowledge every word with click or enter.
Yoroi should give you a hint in red, what it thinks is wrong.
ccvault has been renamed to Eternl a few weeks ago, but it is a good recommendation.