One does not exist. If you are looking for information related the the Eleksmaker, you can use the ‘Search’ feature located to the upper-right of every page of the forum to help.
And for the licensing questions, we get asked this a lot, so we made an FAQ for it.
The timing of when you upgrade is up to you and based on when you want to talk to a DSP based laser. Upgrading from the GCode version to the DSP version is available for you at any time during your current license cycle. The DSP version includes the GCode version as well.