Error Starting Microsoft Dynamics GP After Installing PSTL

Microsoft Dynamics GPI'm taking a slight detour away from posting the series of how to's on the Professional Services Tools Library to highlight an installation error that I've recently seen when installing PSTL.

A client recently installed PSTL and reported receiving the below error message;

Microsoft Dynamics GP - A Get/Change Operation on Table 'gpAppEnabled' cannot find the table

I'd sent them the PSTL download along with the instructions on how to install it without realising that there was a missing part to me instructions (which has now been added).

When installing PSTL into a company for the first time, you must log into Microsoft Dynamics GP as the sa user as there are some tables which get created (covered in KB Article 861564 which is actually a retired article but does mention the issue and the resolution).