I have build UE4.26.2 from source today using VS2019 and it compiled perfectly.
I have created new C++ project in it and played around everything was working perfectly.
I restarted the engine using the old project I created with (U4.25) and it give me the error that libfbxsdk.dll not found.
I Tried to restart the engine using UE4Editor directly from x64 binaries and the same error libfbxsdk.dll not found.