Hang on there Brian and be careful!!!!Yes you could do it that but there is a few things you must be aware before you do anything further:
If you update the Client to 4.4: no issue. (uninstall 4.3 client, install 4.4 client).
If you update the content to 4.4: Content update: The Beechcraft airplanes from 4.3 are not replaced in 4.4 (but you have a backup copy so you can put them back in after you have done the 4.4 content update. (uninstall 4.3 content, install 4.4 content).
(If not doing a scenery update, at this point run FTXCentral > Force Migration also delete your shader folder in C:\Users\your name\AppData\Local\Lockheed Martin\Prepar3D v4
and sceneryindex64 folder in C:\ProgramData\Lockheed Martin\Prepar3D v4
If you update the scenery to 4.4 or the Full install:
Now you get a bit tricky. For an Orbx/FTX user, there is no advantage doing a scenery update but if you do, you have to set up all your scenery again as to scenery.cfg. (It would appear that don't use the addon.xml method to add scenery/effects/gauges/world scenery etc but have used the sim root folders and the default sim configs and the actual scenery library (which is all contained in the scenery.cfg file) to set up all the addon stuff.
If you do the scenery update: (or full install) do the following:
1) Backup your v4.3 scenery.cfg which is in hidden folder C:\ProgramData\Lockheed Martin\Prepar3D v4.
(Cause you'll need it unless you want to reload the 4.4 scenery.cfg by hand!) because v4.4 install will wipe out all of it including removing all add on scenery entries from your scenery.cfg or sim library. Also backup the rest of the cfg files if you have added/edited. (IE: location of other Simbobjects etc in simobjects.cfg).
2) So if you do the 4.4 scenery install (or full install) be aware that you will have to re-Install Global and FTX HD Trees again files then you should be able to run FTX Central V3 and it should update the rest for you as the rest of Orbx/FTX stuff is contained in the main Orbx Folder and won't be removed.
3) BUT for all other you will have to reload/repopulate the scenery.cfg file for all your other scenery. (Hence the previous scenery.cfg backup or copy from hidden folder: C:\ProgramData\Lockheed Martin\Prepar3D v4.)
4) After install of 4.4, re-add the two Tongass and RTMM entries from your saved scenery.cfg to the new 4.4 scenery. (Also for tongass you will have to readd the 40 terrain entries to the terrain.cfg file also found in: C:\ProgramData\Lockheed Martin\Prepar3D v4
Note: IF you do a full install or a scenery.msi install of 4.4 all addon scenery files that go into scenery-world-scenery or into scenery-global-scenery which includes ORBX, REX, all RTMM ADEX and ai traffic bgl files will be lost. so after your move to 4.4 willl have to be loaded or reinstalled and the addon scenery entries in the scenery.cfg redone (Hence the backup copy before your v4.4 install.).
The other stuff: Sound, Effects, Gauges, World traffic files etc you can copy/paste from your backup copy but when doing it you should keep any newer files that are installed with the default 4.4 install: keep the newer files (so don't use overwrite) .
Just be careful with that scenery.cfg they all have be numbered right or you'll get sim errors.
5) IF you do the scenery part: go into FTXCentral > Force Migration also delete your shader folder in C:\Users\your name\AppData\Local\Lockheed Martin\Prepar3D v4
and sceneryindex64 folder in C:\ProgramData\Lockheed Martin\Prepar3D v4
And after all is done in the adding of the scenery in the sim lib (scenery.cfg), then make sure you go back into FTX Central v3 and re-set the FTX insertion points.
(FTX goes below RTMM Libraries)
OpenLC goes below Tongass Lower)
Also take a read at this forum which might be helpful from others who have done it already and problems experienced and how to avoid the problems.
https://www.avsim.com/forums/topic/545919-first-reactions-to-p3dv44/and the main read: How to:
https://www.avsim.com/forums/topic/522254-ftx-orbx-scenery-prepar3d-updating-reinstalling-troubleshooting/If you run the Install_Client.msi and the Install_Content.msi only you won't have to re-do any of your scenery at all.
To help in a decision: The New Prepar3d 4.4 Scenery piece adds the following:
Prepar3D Scenery-Fixes and Improvements
Fixed trench running through large areas in Iran.
Added several representative military jets to AI traffic. These require military cargo/combat parking spaces to appear.
Fix for specular value of bare desert that caused background globe to be brighter than generated textures.
Golf courses can be layered on top of airport backgrounds.
Added several new scenery objects including warehouses, wooden pallets, wooden shipping crates, and military tents.
So up to you but be careful. This is a long post but hope it is helpful for you and others reading.
Norm