what is offline update?
have a look in the link helpx......
and choose the installer (offline) you want
Still having problems?
If you are still having trouble installing Adobe Flash Player, try downloading the installer directly from the following sites:
Flash Player for Internet Explorer - ActiveX
Flash Player for Firefox - NPAPI
Flash Player for Opera and Chromium-based browsers - PPAPI
Offline - mean install the installation on your PC and install/run from it?)
Online - direct install through the network, via Avast, Browser, or other s/w?)
thanks