Avast password manager was end of life and removed at the beginning of this year and replaced by a web based password manager.
Have you got avast on a pc with your passwords as you can transfer from the old manager to the new one but im not sure how to do it only on a mobile phone. once its been done on a pc you can then download the new avast password app.
check some of the posts here Transition to Avast Password Manager
This is on a pc.
