Hello!I found an XL Airways Texture on avsim.com.This Aircraft is from september 2011. So, can I use it this pack with the new SP1b 737 NGX?When no, what do I have to do for use it?

You can safely use it, provided you do not use supplied options configuration (if any is present).

You can safely use it, provided you do not use supplied options configuration (if any is present).

AH OK. Thank you.The Update is only regarded to the options configuration and not to the livery itself?

Yes. The textures themselves are same.