b44720d5__Installer_3_7___Release_Notes__Known_Issues
[Component] Installation: Toad for Data Analysis [Change Request] N/A [Known Issues] 
TDA will abort the install if it detects a DB2 Version 7 client: TDA will exit the install if it detects that a DB2 client of Version 7 or lower is currently installed, and will return the error code 200. Workaround: If the installation of TDA aborts with a 200 error code, rerun the installer and deselect TDA in the 'Product Selection' screen. All other applications should install correctly. Other error codes that TDA may return (and will also abort the install process): 100 - MDAC version is older than 2.6. 256 - The internal command passed to msiexec exceeds 255 characters. 500 - MSI execution failure.
Quest Installer 3.7 – Release Notes
Known Issues