Блин, народ! RTFM пожалуйста!!! )))
Там же все по шагам расписано!

1. Backup all your existing pilot data and log book, TEs, campaigns, ACMIs, and multiplayer
connection phone book, if you wish. The pilot data and log books are found in the
Falcon4\config directory, while the TEs and saved campaigns are found in the directory
Falcon4\campaign\save directory. The ACMIs are found in the Falcon4\acmibin directory, and
the multiplayer connection phone book is the file named phonebk.dat in the root Falcon4
directory.
2. Un-install Falcon 4.0 from your computer. After un-installation, manually delete the Falcon4
directory using Windows Explorer if the directory is not removed. Then, reboot the computer.
3. After the computer has successfully rebooted, re-install a fresh copy of Falcon 4.0 from the
original CD. After you have installed Falcon 4.0, reboot the computer again.
4. Once the computer has rebooted, install the Falcon 4.0 v1.08US patch. This is available for
download at http://www.falcon4.com and other Falcon 4 websites.
Cautionary Note on Windows 98 Second Edition
The version of the “msvcrt.dll” file included with the Falcon 4 CD is
dated August 5, 1997. This can be found in the root Falcon4
directory. You should delete this file before installing v1.08US patch,
if you are using Windows 98 Second Edition. Failure to do so may
prevent the 1.08US patch from installing all the necessary files
required for the RP4 installer to function properly. A newer version of
the “msvcrt.dll” file will be installed with the 1.08US patch.
5. When you have successfully installed the Falcon 4 v1.08US patch, reboot the computer.
6. Place the RP4 installation zip archive in a convenient directory on your computer. Unzip the
installer zip archive. You will find the RP4 installer named “F4_RP_v40_Installer.exe”. You will
also find installation instructions and some documentation. Place the RP4 installer in the root
directory of the Falcon 4 installation on your computer.
7. Open up Windows Explorer and double click on the RP4 installer icon.
8. The installer will display a window showing that it is uncompressing and unpacking the files,
and will search for your Falcon 4 installation directory. You should see then the following
dialog box (see the next page). You should note that the path of the executable will depend on
your Falcon4 installation, and may not be the same as the screen shot below.
9. Select the “Apply Patch” option, and the installer will automatically install RP4 pre-patched
executable and data files for you, and it will then quit. Do not select the “Advanced” option yet.
10. The new RP4 Falcon 4 executable will be named “Falcon4_RP_v40.exe”, and may be found
in your root Falcon 4 directory. You may wish to create a shortcut for it on your desktop or in
the Windows start menu.