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Hi linda,
You can reinstall latest version on existing one.
But I would suggest you to have a whole site backup.
One another important thing is, if you have customize any code then it will be gone after upgrade to the latest version.
So please have a copy of changes files and after upgrade need to be merge the changes.
Thanks
Hi linda,
I have backup whole site using akeebabackup.
Do you want me to upgrade jomsocial with latest on behalf?
If you want to do with your own then just go to
1. admin and login
2. Extension > Extension manager
3. Select "Manage" from left sidebar
4. Search with the word "community"
5. Select first row "Community"
6. Press uninstall button
See screenshot of the step with numbering.
Do same process and to uninstall all modules and plugins by searching two words "community","jomsocial".
Thanks