Hello Susan,
I recommend updating the browser to the latest version on the old PC, then turn on Sync and wait until data are saved on our servers. Then you can install the browser on the new PC and turn the Sync on for the same user account in the browser. Data shold be synchronized.
To turn on Sync:
* Go to settings
* On the top of the page, click Sign In
* Finish the process of setting up the Sync (Create an Avast Account if you don't have one)
* See status of Sync in the settings page - It should show it is ON.
