Finally found (hate Win 10) the dll & did all the googled advice & still no joy!
Question is the install exe programed for a single use only?
As after buying IS3 I installed & used it successfully in FS2004 on my win7 PC, no problem.
ThenSeeing FSX on offer from Steam bought that, & installed it on my win10 gaming laptop. i copied over the IS3 install exe which seemed to install IS3 no prob, but even after finding the correct dll, & coping it in to the game. Zilch..
I then tried installing FSUIPC4 for FSX the addon option appears on the top taskbar but only for fsuipc4. Which made me wonder if Instant Scenery 3 is for 1 computer use only?
Anyone know?