I'm afraid I encountered the same problem than some of you. When installing the plane in 410.1 UP 3.0 RC4 without adding the 2 lines in the air.ini, the plane shown and flown is not a d510 but rather an Avia with upper and lower wings, dressed with a French skin.
When I add the 2 lines, crash at 60%. When I dequalify them (//D510 and //D570), works again, but still flying an Avia.
Of course, I'm using the latest SAS buttons file (v9.4).
So ich habe bestimmt ein Fehler gemacht, aber wo?
Looks like what was described by Epervier, but I didn't understand what he meant about an improper download. I've been using the Dewuatin link. I put the planes under #UP#/D510 and #UP#/D570.
Any help will be appreciated.
By the way, using explanations provided here,though I am an absolute beginner, I was able to install RC4 starting from the DVD's 4.07 version without a bug (El Camino Real). It took only a few hours (even less) to go through the various steps, everything went smoothly and I can enjoy fabulous skins and sounds. The next step will be DBW (I'm flying offline).
Thanks to everybody / Danke Alle / merci à tous / Grazie