Hi Paul
Sure, no problem

The 9.1 update (FS9 to 9.1) is
HERE and the 9.1 NOCD patch is
HERE 
Be sure to only use the 9.1 NOCD patch with FS9 updated to 9.1.
If your setup is already at 9.1 and all you need is the NOCD patch, simply move the current FS9.exe to a safe place and replace it with the patched file (don't leave the original in place and let it be overwritten)
If your setup is original FS9, keep your disc4 handy.. run the update then restart the sim. Once done, close the sim and replace the updated FS9.exe with the one in the 91nocd.zip (having first removed the updated 9.1.exe to a safe place). Don't worry.. the exe files do not show FS9.1.exe.. they retain their original titles. Next time you start the sim, you'll not be prompted for disc4
ATB
DaveB
