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The announcement of this release (on the forum) states that one can install the the update over the previous 15.x installation. However, there is no way to set that destination during the installation process. Nor does the exe automatically find the existing installation. It just keeps trying to install a new version in the Windows folder. Help????

Maybe you previously installed the 342bit version?
In that case, you will need to uninstall it first.

Thought of that too, but double checked "About" just now - 64-bit.

I apologize. I tried again. There was some security issue that I have never had before - must be because of a recently updated anti-virus/firewall setting. But I fought the system (lol) and got it to work. Thanks!