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ISSUE SUMMARY:
In this screen I try to place the license (*****) but it doesnt work. It has the wrong installed version (developer) I switched to cheaper single license.
I cant access your joomla backend.
please goto jomsocial.com > my account and download the jomsocial package at there.
unzip it, you can find ijoomla installer and jomsocial package there.
goto joomla extensions > manage > install.
install that ijoomla installer. after that try to place the license code again. if still cant, please install jomsocial package from joomla extensions manager.
this step is safe, this is old way to upgrade/install jomsocial at your site.