The silent installer for Toad 9.5 does not have settings to uninstall or upgrade the previous Toad install of 9.1.
WORKAROUND:
If the users only have Toad 9.1 installed follow the steps below to uninstall 9.1 and install 9.5. This will upgrade the Toad, keep the user files, if everything was installed into the default "C:\Program Files\Quest Software\Toad for Oracle" folder. For more information and settings, see the "Getting Started Guide" in the Toad \Docs folder.:
1. Go to http://support.quest.com and download the Toad 9.1 installer exe if you don't already have it.
2. Run the installer. You'll find a menu that'll let you extract MSI.
3. Extract the MSI to your computer.
4. Run the command line to silently uninstall 9.1:
>msiexec /x "C:\ToadforOracle91SetupFull.msi" /q
5. Preform the command line to silently install 9.5:
>msiexec /i "C:\ToadforOracle95SetupFull.msi" ADDLOCAL=Client,Server /q
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