Hello,
Thank you for your message.
Could you please double-check if you still have the following folder saved/backed up somewhere from your previous Windows installation:
\%AppData%\Roaming\Remote Utilities Files\backups\? This folder contains the backup files for the address books in your Viewer, so if you have the copy of the folder you can manually restore your address book with all Hosts by following
this tutorial.
Unfortunately, if there's no copy of the folder from the previous Windows installation, you will need to add Hosts manually to your address book as described
here.
Please let us know if you have more questions.