This documentation is for current versions of ActiveReports.
Older versions are here.

ActiveReports 11
ActiveReports 11 User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 11 Server User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 11 Server Designer User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 11 Server RESTful API GuideOnline Help   
ActiveReports 10
ActiveReports 10 User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 10 Server User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 10 Server Designer User GuideOnline HelpPDFCHMMSHelp3
ActiveReports 10 Server RESTful API GuideOnline Help