An explanation of the "Project is unviewable" problem can be found here :
It is important to distinguish between opening the add-in file (for example, by clicking "File" and then "Open") and loading the add-in (for example, using the add-on button on the Developer tab). Open the file when you want to edit and test it. Download the file as an add-in when you want to use it.
In general, if you download VBA as an add-in, then any time you want to edit it, you need to open .dotm in Word (File ... Open) before trying to access it in the VBA editor.
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