SDT - installing the tool for GP 2013

According to the instructions, the SDT should be unzipped and installed at the C:\Program Files\Microsoft Dynamics\GP) level.  I did that. (I am using the most recent version).  When I went to open GP, my messages were:

1. New code must be installed.  I clicked yes.

2. Next message - unable to find table.

3. Next message -  unable to include new code.  

And, I cannot launch GP 2013.

Any suggestions for getting this installed?

Thanks,

Judy