Dear Sir i purchase now 3 plugin  No-1 ( Facebook Login Osclass Plugin ) No-2 ( Google Login Osclass Plugin ) No-3 ( Online Chat Plugin )  but all not working       Please Please Fix this issue we will thankful to you and your team

Please check this error
Plugin couldn't be installed because of: Error importSQL::ModelSR
facebook_login/model/struct.sql
1142 - DROP command denied to user 'expatri1_osclass'@'localhost' for table 'oc_t_user_facebook_login'

Hello
Your mysql user you use to connect to database has insufficient privileges (expatri1_osclass)

Please contact your hosting provider to grant full privileges to this user.

It may fix other issues as well (there might be issue also with creating tables or index, altering tables etc)