Here is the fix you need for the activation.
Windows 10 is in fact very FSX friendly.
Is must be run as an administrator.
You must install FSUIPC, free version is enough.
You must apply the UIAutomationCore.dll fix.
To Fix this problem you will need to edit a value in the "System Registry" Click start menu > type into the search box ( regedit ) you will see listed under programs - an icon "regedit.exe" > click "regedit.exe" program icon, to open > We will be searching for this Key > {4D36E967-E325-11CE-BFC1-08002BE10318} (Case sensitive) exactly as shown, it will be found under HKEY_LOCAL_MACHINE as you will see from the directory tree in the picture below.
Please be aware you are about to delve into the system registry, accidently changing a critical value in the wrong place may cause failure to boot or unstable OS. However if you follow the instructions you should have no problems with this simple edit which only affects FSX.
> HKEY_LOCAL_MACHINE
> SYSTEM
> CurrentControlSet
> Control
> Class
> {4D36E967-E325-11CE-BFC1-08002BE10318}
- In the Right panel lowest entry find UpperFilters then double click the word "UpperFilters" a dialog panel will open.
- In the dialog box "lower white section" - Change Data value to PartMgr
- Note case sensitive Value capital P Capital M
- When you have edited the value in the Dialog click "OK" to close then exit regedit.
- Start FSX and you will be presented with the FSX Acceleration Activation panel, Enter your 25 character Acceleration product Key, allow online verification.
- Activation should be complete, No more demo mode, but you may also need to accept the new AccPack Joystick key map for new aircraft and mission pack as part of the process.
Windows 10 is in fact very FSX friendly.
Is must be run as an administrator.
You must install FSUIPC, free version is enough.
You must apply the UIAutomationCore.dll fix.