Many campaigns from earlier versions can't be played in 4.14.
Sorry can't help further. Only suggestion would be obtain a 'IL2 1946' disc and update to 4.08. Then that will give you the freedom for multiple installs that you could update to UP3 for online play on the SAS server, or the excellent and massive "B.A.T." that has over 2,000 aircraft!
I figured so I just uninstalled it (luckily it had such a feature) so I was able to get the game going again; ah well, mommy is getting me a new PC for Christmas so I might well reinstall and patch up to BAT level of usage. I hear staples has excellent download speeds.