Step 1 : Click over “Customize and control Google Chrome” icon which is the following icon 
Step 2 : Then Click “Settings” from the Menu
Step 3 : Scroll the Settings window until you reach “Show advanced Settings … “
Step 4 : Click Over “Show advanced Settings … “ link
Step 5 : A New Section will show up, Scroll until you reach “Downloads” Heading
Step 6 : Tick Ask where to save each file before downloading
and that will keep Google Chrome asking for where to locate files each time you would like to download a document.