Well, as a rule, I never use the auto-installers available.  In general practice they work okay, but sometimes you run into problems with them.

The way I install stuff is to download, then extract it to a temp folder on my desktop and pull the files out manually and put them where they need to go.

For the actual aircraft, just drop the main folder into your FS "Aircraft" folder and it will show up in the selection menu (or should ).

For the gauges, just copy them over to the "gauges" folder of FS.  DO NOT OVERWRITE ANY GAUGES!!!  This is important.  I have seen many people have to reinstall FS simply because they overwrote with other gauges that were corrupted or didn't work right.