You can download AfterLogic WebMail Pro .NET 4.8.15 at:
http://www.afterlogic.com/download/webmail-pro-net.zip

1. If you are using WebMail Pro 4.5 or any older version, contact us for upgrading your license key (it's free for registered users). Please specify your e-mail address you used to purchase the product or your order number. This will allow us to locate your order and send you the correct license key.

2. Move your existing WebMail Pro installation to any backup location, including the data folder. Back up WebMail Pro database as well.

3. Extract all the files and folders from the downloaded archive to your WebMail Pro installation location. If your WebMail Pro data folder is not App_Data, place the App_Data folder contents to your data folder location.

4. Restore the following files and folders from the backup location to WebMail Pro installation:

in web folder:

• web.config

in App_Data folder:

• settings/settings.xml
• settings/adminpanel.xml
• Mail folder

5. Starting from 4.7.12, AdminPanel is no longer a separate IIS application. Thus, if you use AfterLogic WebMail Pro 4.7.12 or below, you should remove this virtual directory from your IIS configuration (it should become a simple subfolder of WebMail virtual directory) and add the following lines to the main WebMail Pro web.config file:

<appSettings>
 <add key="WebMailFolderPath" value=""/>
</appSettings>

6. Navigate to WebMail Pro Admin Panel:

http://<WEBMAIL-PRO-ON-YOUR-SERVER>/adminpanel

7. If you've received new license key according to step 1, navigate to License Key section, replace the license key and click Save.

8. WebMail Pro should get all the settings from the previous WebMail Pro installation, you just need to update WebMail Pro database format by clicking "Update" button in Database Settings screen.

9. Once logged into WebMail Pro itself, don't forget to press Ctrl+F5 or Ctrl+R to update web browser cache to avoid JavaScript errors.