@skyclaw07 Note, resetting your password will clear all sync data. Otherwise anyone who was able to access your listed email would be able to reser youe password and access everything. So make sure you have a copy on at least one device. Otherwise you'll be starting new.
@juiceboxkai If you don't remember your Opera account password, just go to auth.opera.com while logged off or using a private window and use the "Forgot My Password" tool.
@afnhermes Unfortunately, if you don't remember the old Opera account password, your synced saved passwords can't be decrypted and, therefore, won't be available to be used.
@Adilkhanreal To get your synced data on the new installation, you need to login to sync using the profile icon on the top right, menu > synchronise or settings page.
@nudewing If your old computer is still working, it would be possible to export all your old passwords to a CSV file, and then import them into Opera on your new machine. But to use Sync, you need the old password as your passwords were encrypted to that.