Error: After checking the MD5 check sum of the downloads in C:\Users\*yourname\Downloads (100% OK)
and extracting with WinRar the Flat Installer files into C:\Users\*yourname*\Desktop\Prepar3D14\
I received (when installing) an error 1335 saying the cabinet file 'Data14.cab is corrupt.
Resolution: Extract the downloads in the same folder C:\Users\*yourname*\Downloads as they are received and install.
Installation as in the Prepar3D_Download_and_Install_Instructions.
LM: Good job!