So I got back to work where I could reach the admin console (for the fun details on that, see Bug
Bug 31163), and I tried to go reinstall my license... and now I know why the installer puked on it.
It appears it may not be valid.
The admin console gave me this message:
"""
Message: Your license file is not installed due to the error: system failure: error in uploaded license Error code: ZaLicenseInstallWizard.prototype.installCallback Method: AjxException.UNKNOWN_ERROR Details:system failure: error in uploaded license
"""
My thanks to whomever made it at least possible to copy and paste that message.
Been nicer if the message was, y'know, in English, and meant something, but what can you do? :-)