I have bitdefender total security 2015 64bit installed in my pc with a purchased valid licence. I want to manually update bitdefender ts 2015 with weekly.exe file. But when i try to install weekly.exe update file, it shows me "you need to installed a bitdefender product in your pc to install this update",when i press "ok" , the setup closed every time. I need help for this problem. See Attachment File. 
Build :- 19.2.0.142
Virus Signatures :- 5876669
Engine Version :- 7.61843
Windows 8 Single Language 64bit
intel core i5
4gb ram
1 tb hard disk
