JFBConnect Upgrade installation failed

In the admin area, disable the JFBC System, Authentication, and User plugins for the time being. That should get your site back up and working.

As for the issue you're mentioning, that seems to be a permissions issue on your site. Check that the tmp and component directories are writeable. You can do this through Help->System Info and click on Directory Permissions. Make sure that all the folders are writeable and green.

Then, try and install again.

If that doesn't work, you may want to unzip and copy the JFBConnect.tar.gz file to your temp directory. Then, in the Joomla installer, you can point to that specific directory.

None of the above should be happening normally though, so you may want to check your overall Joomla configuration and see if you're able to install other extensions, like some of the JFBC Modules, just to test.

Please let us know what you find and we'll help you get up and running as quickly as possible!

It definitely sounds like some sort of protection/security issue with your server. If you can't install other extensions (even if it's just a different error), I don't know what I can suggest to help.

It's strange that the system, user, and authentication plugins seemed to install properly. They're included in the overall JFBConnect package, but I honestly didn't think they would install without the main component installing. However, JFBConnect uses the 'upgrade' method of installation, which means you can simply install it over and over again without uninstalling it first. For this reason, you may have some luck trying the following:
* Create the directory /administrator/components/com_jfbconnect
* Create the directory /components/com_jfbconnect
* Try installing again

Since the error above is creating the directory, hopefully, this will resolve that issue. Please make sure the directories above are writeable as they will each have many subdirectories that also need to be created.

Keep us posted, and good luck!