As in subject, it says "you cannot install extension from this provider, for more info check...blabla". I had it for like 6 months or longer, didnt updated my chrome but just now it pops up. I'm mentoning bcs every time i get on battlelog.com site i get warning that windows(xp) cannot find file C:/Program Files/Battlelog Web Plugins/Sonar/0.70.4/SonarHost.exe
You not talk about BBLog, you talk about the Battlelog Web Plugin.
You must goto DICE for your issue.