I have just been through this when attempting to install the VWB indiors. Here is what I did to correct it:
1. Delete the indior from the Expertsgt;Indiors folder with the navigator
2. Open the editor and then start the MQ4 file in the loion where you originally downloaded .
3. Using the editor, save the file into the C:\program files\metatrader4\experts\indiors folder (or where you installed the program).
4. The indior should now be visible in the Custom Indiors folder on the navigator window.
5. When the inior is hauled onto a chart, or added with a right mouse click, then it will get compiled and will subsequently run.
I have no idea why this is necessary, but it is the only way I could make it work. It looks like the editor must add something when you start the file and save it in this way.