having begun the IXEG 733 development at the later stages of Version 9 of X-Plane....and witnessing the transition to 10, 11, and now 12.  It really is not worth the effort to support past versions ..sadly there just isn't enough users to justify the effort.  As my Dad used to tell me,  "keep up or get left behind".   I did not like hearing that many times... indeed I did fall behind at times...but that didn't make the maxim any less true when dealing with large populations.   Sorry about that..
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