i forget old password.but here avast want old password …what can i do?
I think you are out of luck, the idea of the password is to prevent unauthorised access to your passwords.
So unless you have made a cryptic not on what the password might be its locked.
You can check this FAQ but I don’t think it will be able to resolve this - https://support.avast.com/en-gb/product/Avast_Passwords/#pc