This situation is because old version of PuTTY used to be installed with a different installer (.exe file). As example if a device has version 0.66 and try to install latest version will get a message:
"A version of Putty is already installed on this system using the old Inno Setup installer. Please uninstall that before running the new installer"
Devices with any version prior 0.69 will require the old version to be uninstalled and the new one to be deployed.
For additional information see the links below:
Alternatives for uninstalling the old version and deploying versions, could be Scripts or Managed Installations.
For additional questions or require assistance please contact the Quest Support Site.
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