Error Updating AIR

Windows 7 system.

Current AIR version installed in all workstations: 16.0.0.245

Downloaded 16.0.0.273 installer from http://www.adobe.com/products/air/runtime_distribution3.html. Extracted MSI file (using WinZip). Whenever I run the MSI file the following message is shown:

"Another version of this product is already installed. Installation of this version cannot continue.."

If I run AdobeAIRInstaller.exe file, it will install OK and upgrade to latest version.

Using ORCA I checked that PROPERTY/PRODUCT CODE is displaying same GUID than current installed version .245. That could be the reason why is showing the error message.

I downloaded the installation file several times with same results.

I changed the GUID (last digit) to make it different than current installed version, but shows different error.

Any ideas how the MSI file can be fixed? or maybe ADOBE need to make the changes in the GUID?