Message you got seems clear to me:
You need to upgrade your CBSubs bot plugin with the updated one for CBSubs 4.0 RC1.
Your CBSubs 4.0 RC1 package (best to download from the nightly build) has the:
joomlaplugin_cbpaidsubsbot-4.0.0-rc.1.zip
Install this and the warning will go away.
Also how do i re instate the admin account. It has disappeared . I can log in under my user name (with admin permissions) but not the Admin username any longer.
From a private message you sent me I see that the admin credentials you gave me still work.
Please check the messages we exchanged with your JimE account.
Suggest before you make any changes you are uncertain of you take backup.