HOW TO change version from Visual Studio 2015 Enterprise to Professional

You must uninstall the installed version to install the new one. The two version cannot be installed in the same machine, when you run the Installation of Visual Studio 2015 Professional the installation stops because another version is already installed.

I suggest you, before to uninstall, to navigate to the Windows Control Panel to modify existing installation so that you can take note of the components/features installed.

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the process may not have access rights for the private key

I’m changing a NAV Instance to use a new certificate but the service fails to run, looking at the Event Viewer I can find the following error message:
The service <ServiceName> failed to start. This could be caused by a configuration error. Detailed error information: System.ArgumentException: It is likely that certificate ‘<CertificateSubject>’ may not have a private key that is capable of key exchange or the process may not have access rights for the private key.

Run MMC, click on File -> Add/Remove Snap-in…, then add Certificates, selecting Computer Account and Local Computer
NOTE: Identify the relevant certificate and verify that a small yellow key is shown in the icon, if not it means you don’t have the private key for this certificate so you need to import the certificate with the Private Key.
Right-click on the certificate then select All Tasks -> Manage Private Keys
Click Add in the permissions window
Add the Service Account that run the NAV Service (in my case it was “Network Service”).

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