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Where did you install the Big Thumbnail Pack? Have you pointed the Library Object Manager at the folder where it is located?
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Also please understand how ADE works in delivering a thumbnail for a placed library object. Each object has a unique identifier called a GUID. ADE uses the GUID of the object you select or place to look for a thumbnail in the folder structure defined above. If it is found then the thumbnail will show up. The BTP is just a collection of small pictures of objects. It does not contain any objects itself. So you never place anything using the thumbnail but rather using the object data. Place something using the Right Click Menu
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There are the 737's showing thumbnails So I can add it (I can add it whether or not it has a thumbnail of course)
Here is the result:
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The object will show with its correct shape if you have detailed object footprints active. The tooltip (if you have them turned on) will show details of the object including the thumbnail if available, In any case it displays the name and which library object bgl file where the aircraft model is stored.