Can't install addons or updates in CP

I'm just starting to try Statamic 3 on a Windows Server running IIS.

I've figured most of it out and it seems to be running pretty good with the exception of installing updates or addons. When I click to install, I get a dialog which shows a heading/title and below it is a black blank space. I get prompted that it gets installed but it never does.

I am able to install updates via the CLI but I'd like to be able to use the CP.

Has anyone seen this or know what the cause may be?

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