Upgrade to 2.3 Failed with blank screen

[ISPr_Winter]

So this morning I tried, mercifully only on my test install, to upgrade from the latest official release of XenForo to the new v2.3 release out this week. But shortly after starting this the browser returned a blank screen on the URL [forum]/install/oc-upgrader.php . Now every page of my forum returns a blank screen, no matter what URL I load (admin or public or direct upgrade pages). I've never had this issue before with XenForo (upgrades are always very easy via the admincp) and am not sure...

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Upgrade to 2.3 Failed with blank screen

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