the only thing i can try now is to change the settings to 2048 x 2048. but therefore i need the root of the textures
To change to the 2048 resolution, you don't have to do anything other than selecting the appropriate option in the Addon Manager.
in my folder there are only 4 textures (.dds).
That's how is supposed to be, in the scenery folder.
in witch folder does the installer write all the files ? is the only folder that one ?
Most of the scenery and texture files are under the Simobjects\Misc folder but, as I've said, they are NOT related to jetways. Jetways are in the scenery AFCAD (AP_CYVR.BGL) and their texture (CYVR_finger*.dds) are in the texture folder.
Being in the scenery AFCAD, they are ONLY controlled by that and all the files needed are there. So, basically, the jetways are the only thing that will always work even the entire installation had gone wrong (but it hasn't, since you see the scenery)
Which means, either you have an AFCAD in conflict, or there's some kind of problem with your video card that can't draw jetways for some reason, which is why I've told you to lower the resolution to save video memory.