I downloaded V 2.6 and attempted to install it. It kept asking for a FSFlightLog.msi file which couldn't be found and then just kept looping. The only way out was Ctl-Alt-Del. I finally found the file folder FS Flight Log and deleted it (there was no ".msi" file therein). Thereafter, V 2.6 seemed to install OK.
I then installed V 3 which seemed to go OK.
I then opened V3 and discovered the manual for V 3 wouldn't open. Neither would the tutorals.Just nothing happened when I clicked on them.
I went to the file/new/options as suggested, set the FS version to FS2004 and then got stuck specifying file locations - haven't a clue where scenerydb and BGL files are located. In fact, very little worked "as advertised"
I have done this whole routine 3 times and wasted an hour thinking I had missed a point somewhere.