HI.
Make sure that you're using LATEST version of iJoomla Installer.
You may download it from here:
www.jomsocial.com/component/digistore/licenses
It's inside your current JomSocial plan package.
If you still have issues - upgrade JomSocial using regular Joomla! Installer.
Hi.
It seems that installation failed on your server.
I need to have access to FTP.
Please, edit your first post and provide FTP credentials.
Hi.
I uploaded fresh files for both front- and backend.
But I can't login to backend. Did you changed access credentials for SU?
Hi.
Everything seems to work as should now.
Please, check it.