@Ryan,
I use 7Zip for everything and have been problem free. Either option is good though.
@vl82m,
Hard to explain where the interest originates but some of the following factors are involved at least for me:
1. General interest in Soviet-era aviation.
2. It's a unique, infamous airliner with major attributes that are unseen in almost all other civil aircraft.
3. I enjoy the quality of the addon. It's a systems simulation of something from decades past, and that alone interests me. It's Soviet origins and associated systems, which differ significantly (in some ways) from standard Boeing and Airbus types are interesting to me.
4. Even though I'll never understand everything about this addon (and it looks like many in the Russian community have difficulty as well), knowing that I can at least figure it out enough to operate it in reasonably safe and competent manner (I realize that's subjective) is rewarding to me. There seem to be very few in the flightsim community, and even fewer "foreigners" as you put it, who have attempted to learn to use this aircraft.
So, part of it is in my general historical interests, part is in my enjoyment of complex addons, and part is in the exclusivity of being able to operate this specific addon within the flightsim community.
EDIT: Ryan, once you get further along with learning it, shoot me a note about the braking parachute. It's not covered in the manual, and I only found out how it works through the Avsimrus forums. In short, there's a switch on the overhead that you need to activate to turn the system on, then when you have touched down, you need to press the spoiler key "usually default is your slash '/' key" to deploy the chute, and press it again to remove it. One time use, and it's a necessity on landing.