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Testing with Exp 4D 10.5.13. Attempts to access the CMAP webstore via the Exp menu are met with several errors "Navigation to Webstore is cancelled" and after retry "Page can't be displayed" with a local IP address also shown.
It also seems the C-Map Map Manager service is stopped.
I had to install manager myself, it did not get auto installed after Exp 4D.
Nick, Exp 4D did not pick up the already installed license from the older version of Exp. Is this issue being caused due to lack of valid license?
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Looks like the issue was Exp 4D unable to connect to the stopped C-MAP Map Manager service. Attempts to start it manually failed. Several reboots got it started. All better for now.