To update your current version of MailWasher Pro, go to Help>>Check for updates. MailWasher will check for the latest updates, download and install the new version. All your settings will be retained.
MailWasher will periodically check every 2 days for a new version, and you can change the update settings at Settings>>General>>Updates. Your options are:
1. Automatically check for update
2. Check for updates every X days
3. Folder to download updates to