1. Go to the folder where you have your Ultima Online Installed.

2. Find the directory Patch and delete all files inside if there are any of them.

3. Then go back to the Ultima Online directory and find file called Client.exe or just Client.

4. Run this file and and you should get a screen like the one after this text.

5. When it says: Downloading patch 6.0.0, click Cancel.

6. Delete again all files in directory Patch.

7. Start your Ultima Online like before and if everything is good you will have the last version if UO.

8. Log in to Paradise Found and have FUN :)

Or use this instruction from Kariahna.