IDM normally prompts you with some automatic download options upon opening a website, this is quite handy but it may happens that you want to have the reverse effect.
That is: "Restricting automatic download for specific file typed from a particular website".
Click on the Option button (two overlapping gears)
Select the File Types tab
Click on the Edit list button
In the dialog that opens click on the "Add" button.
In the "Add an address to the exceptions list" type the URL of the website
Note that: Make use of the /* operator to define the file types (.bin, . img...etc)