How to Upgrade a One-Click Install
Log into your DreamHost panel > Goodies menu > One-Click Installs > and click "Manage Installed Applications."
The Domain bar shows the number of installed applications for each domain and the number of upgrades available. Click on the Domain bar to expand it. This shows the action buttons. Click the Upgrade button.
Click the Upgrade button. Your existing site will be copied to a new folder so that you will have a backup. Click Ok.
After you click Ok you will see a progress indicator and once it is complete, a Success! message.
After successfully upgrading your application, the "Needed Upgrades" reflects the new status.
That is how you upgrade your One-Click Installation