You can upgrade from this add-on https://xenforo.com/community/resources/login-as-user.2493/. When updating a resource, all necessary and old add-on data is transferred to your forum.
This add-on gives privileged users the ability to login as any other user on the forum (as long as they're not whitelisted).
Key Features:
This add-on gives privileged users the ability to login as any other user on the forum (as long as they're not whitelisted).
Key Features:
- Permission controlled - choose who can login as another user
- Whitelist - define users that cannot be logged into by others
- Make users supply a reason when logging in as another user
- Send a conversation when logging into another user
- Doesn't cause your IP to be logged with the user being logged into
- Alerts, conversation, threads are not marked as read.
- All logins are logged to the moderator log
