Hi, Sergey.
Did you unziped package before install?
Hi, Sergey.
It seems that files ware not moved to folders:
prntscr.com/455d8l
I'll need access to FTP, please edit your first post and add FTP credentials.
Hi, Sergey.
I managed to bring back your backend. But will experience issues with installing anything since you have issue with temp folder access or permissions:
prntscr.com/456j34
Please contact your hosting provider for assistance with this issue.
Temp folder needs to be accessed as there are unzipped installation files.
Hi, Serrgey.
Yes, next step will be install iJoomla Installer and installation JomSocial via installer.