In fact it's not that complex.
Basically, once you have the payware Corsica photoscenery installed, you just need to download two things:
- the autogen file, which is a very big archive containing some .ASN files to copy in the Corsica "texture" subfolder ("AUTOGEN v3.0" from this page:
http://www.f-bmpl.com/index.php?option=com_content&task=view&id=1066&Itemid=231 )
- an autogen description file, which includes several definitions of autogens from various creators.
This must NOT be installed before setting the FTX Central to "default".. First set FTX Central to default, then you can install the new definitions. I use the AGX freeware from the FranceVFR website. There is an alternative package, I don't remember the name.
There are some optional other files, to add some additional sceneries and other goodies here and there, but the initial steps are the two listed above.
There is also a huge package in development, which will include all airports in Corsica, together with many cities (for more consistent and precise autogen) together with local scenery improvements such as VFR landmarks, all across the island. This package might be ready in July, if we are lucky
I also strongly recommend the newest version of the Solenzara military base located on the eastern coast of the island:
http://www.virtualcorsair.fr/aeroports/zara_X.htm
(download is at the bottom of the page)