Duplicate Aircraft paints on starting FSX

I use FSX on a new PC running Windows 11 in a 737-800 home built cockpit.  I have installed My Traffic V5.1 Boxed.  I then installed  four updates - MYX 51a / MYX 51b / Crossover 52B and Proffessional 54a.  On starting FSX I get a warning that I have duplicate aircraft paints.  My clicking OK I just get the next paint Number.  There would be hundreds of these aircraft, so the only way out is to close FSX and remove MYX 5.1 from Control Panel/Programs and Features.  51a and 51b were also listed in programs and removed.

If I now re-install just MYX (no updates), I am still getting the warnings that I have duplicate aircraft paints which is not permitted.  I have hunted high and low for any duplicate folders/files/cfg's but can't find anything that might fix this.  Any help would be appreciated.