This happens repeatedly. The the "advanced options" approach listed online for preventing the windows update in Dropbox is not available even on reinstallation. Huge issue. Please fix it. Please don't tell me to right click my Dropbox folder to set offline or to reset my preferences in selective sync...I have done this multiple times and that is not a solution...Dropbox still reverts to online only with every windows update. Huge issue others have complained about..no obvious solution...it seems Dropbox's solution is to close the discussion.