FabHet

... I mean without having to uninstall previous version installed into P3D3 !

If I can afford, I think we shall be able to choose on witch product (P3D3 Or/And P3D4) we want to install the last 747/777 releases (that bring the P3D4 64 bits support)... In that way we could test without braking the all installation in the bad case ... Regards

Last results: - Under P3D3 I found out the 777-300 is made dead by installation of last 64 bits 777-200 revision; - repairing 777-300 under P3D3 restores 777-300 to live BUT kills 777-200 !... I finally remove the 64 bits release for 777 and reinstall the previous 32 bits for P3D3 only (and resets -300)... All gets back alive... but of course no more PMDG under P3D4... There is clearly a problem with P3D4 adaptation !...

My first msg disapeared !... Here it comes back... I had both 777 and 747QII installed and all working ok on both P3D3 AND P3D4... Suddenly, I got the "NoGears/No Instruments" bug for them on P3D4, and, a while after, for 747QII on P3D3 too ! Tried to remove FSUIPC, and even remove reinstall PMDG planes: NO RESULTS ! I remove and replace 747QII by 747-8iv1 on P3D3: returns alive, no more pbs... (777 had no troubles on P3D3) To note: with 747-8v1: NO TROUBLES AT ALL Finally I just can,t get back alive my 777 nor 747QII under P3D4 ! They are defenitly dead ! I guess there is a pb with the new codes inside 777 and 747QII fir P3D4 (I do not critic, I just try to help finding out the bug...)

...(last minute...) And now 777 gets back in trouble too under P3D4, although ok under P3D3 ! 777 has the same problem than 747 too...