Toad for Oracle 10.5 released in mid-April 2010 and I decided to give the (not so easy) update a shot.
Help->Check for Updates on 10.1 said there was no upgrade available
Based on my prior experience you need to manually download the latest executable from their website https://support.quest.com/MySupportLink/MySupportLink.aspx This requires a Site ID which validates your license and your profile.
After logging in search for ‘Toad for Oracle’
Click on the Downloads tab
You would need to know your licensed products. Quest allows you to download all executables if you are not licensed it will only show up as a trial version. I used the Toad for Oravle 10.5 Commercial Installer
Toad does not upgrade the previous version. After installing you will have to import settings from the older version and then uninstall the older version
I had to change the folder to make it work
The Quest SQL Optimizer for Oracle requires you to have .Net Framework. What’s weird about this is there is no version of .Net Framework named 2.1. I received this error message even after I installed 4.0
I love Toad and I am going to give its Toad for MySQL freeware a try : http://www.quest.com/toad-for-mysql/