RE: Error: Product 0 does not support upgrading from version 18.2.1036.
As everyone has stated, you most likely have installed Dynamics GP that is at a version/build that is older than 18.2.1036, thus the error.
If you had installed 18.2.1060, it would prompt to run GP Utilities, but wouldn't throw this error, it would just want to upgrade the databases from 18.2.1036.
If you had installed 18.2.1036, a new install may prompt for GP Utilities, but it would only synchronize the dictionary files and wouldn't throw an error nor ask to upgrade anything, unless new features were added.
If you installed a version of Dynamics GP older than 18.2.1036, that will throw this type of error because we're not able to 'downgrade' Dynamics GP.
When you launch GP Utilities, on the first window after the login window, in the bottom left-hand corner, it'll show a version, what is it showing?