I purchased, and have used FS Navigator since it was first released, in all my various MS Flight Sims.
My FS Nav installation .exe is saved on a number of CD's, for safety, and registration details are always kept safely recorded on paper, (NOT on the Computer HDD!), so that upon each fresh re-installation of the program, and inserting the Registration Key, it always works!
For anyone who did not purchase the original official release, and record the registration key safely....and the original .exe installation program...
..they will be out of luck in running the program successfully.....trust me...

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(Similarly applies to LAGO FSE/FSSE)...

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Paul...G-BPLF....FS Nav.....FS '98...FS 2000...FS 2002...FS 2004....(FSX)....

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...welcome to the FS Navigator Club!...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.