Cannot Install Showcase

[Chicagoreefs]

I have put all the unzipped files on my server and am trying to install from the xenforo control panel. Once I hit install immediately get this error.

Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

I have been working with my webhost and we cannot figure out what is happening.

Any suggestions?
Thanks

 

[Bob]

Could be Mod Security that is causing that. Can you ask your host of they have Mod Security enabled and configured? If so, that has been known to cause numerous issues with XenForo, to include throwing the service unavailable error when installing addons.