I just purchased SSGI on Gumroad which is a global illumination addon for Evee. I have a question about the installation. I can install the "old addons" (Screenshot 1) as usual: preferences/addons. But the "SSGI Native 1.13" obviously works differently. There is blender 2.93 in the folder (Screenshot 2). Does "native" mean the addon is already pre-installed? If so, how does it work? There is still the principled BSDF in the shader editor, which should be replaced by the SSGI node (screenshot). I don't find any other option to enable SSGI. And besides that, there is no way in the preferences/addons menu to install the addon, which tells me, it should actually be there already. (I already asked the support, but maybe it's quicker if someone here knows the answer already.)
Native means native C++ code. Native code is compiled to work directly with the OS. This requires a special build of Blender, not an add-on. As a result, code works faster and performant, but build can be unstable and in this case outdated.
The functionality of the "add-on" is inside of build, so there is no way to turn it on or off.