Thank you for contacting us about your issue. The post that you were folowing was updated. Here
you can see the updated post and folow the instructions there (pay attention to the Installation Instructions
at the bottom). Also I recommend you to folow this video
which visually explains all the steps (I think it will help you solve your problem faster).
Still, if you did all the steps in the post you were following, the only thing you should do is to slightly tweak your simpleimageselector:
1. Go to your page and click "Edit" on the simpleimageselector;
2. Go to "List Settings" and under the "List template" field/(dropdown menu) click "Edit selected template";
3. Paste the folowing markup under the other declarations of the same type:
<%@ Register TagPrefix="samples" Namespace="Telerik.Sitefinity.Samples" Assembly="SitefinityWebApp" %>
4. Then paste the following code, depending on where you want to show the thumbnails:
Value='<%# Eval("Thumbnail")%>' />
Save your setting and you are ready to go :).
This is also clearly explained and shown in the video. Try to follow it and do all the steps, and the solution will work. If you still have troubles with it, do not hesitate to contact me again.
All the best,
the Telerik team
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