CFS3 Firepower Not playing ball...

I have recently been given a copy of Firepower for CFS3 by a friend who's "Lost interest" (!)
On installing, & updating to version 1.08, some things work, e.g. I have B17 Missions & Lancaster Missions to carry out, Nukes also have appaered in my choice of weapons 8-)
Alas, none of the 4 engines heavies seem to appear in my aircraft list.
All are in my Aircraft folder ??
Anybody discovered this problem before?
Had a browse & Shockwaves forums, but, nothing helpful there.
Any advice appreciated - I wanna fly a Lanc!
On installing, & updating to version 1.08, some things work, e.g. I have B17 Missions & Lancaster Missions to carry out, Nukes also have appaered in my choice of weapons 8-)
Alas, none of the 4 engines heavies seem to appear in my aircraft list.
All are in my Aircraft folder ??
Anybody discovered this problem before?
Had a browse & Shockwaves forums, but, nothing helpful there.

Any advice appreciated - I wanna fly a Lanc!