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Incompatibility between Windows Installer and Click-To-Run - Office 365 And Project Professional
Here at the company we have the office 365 proplus installed on all machines. On a specific user machine I had to install Project Professional 2016. I did everything right, I downloaded the ISO from...
That's a know limitation, and is extensively documented online. Read for example here: https://docs.microsoft.com/en-us/deployoffice/install-different-office-visio-and-project-versions-on-the-same-computer