There seems to be a file that is making the driver crash that leads to the code43 error. Have you tried modding other driver versions or using other files as base files?
Post the log file from the FLEM installation folder.
I tried the 'guide' of the main webpage. I modded the 15.7.1 with 13.9 legacy dlls and 14.4 with the same.
Then i manually installed 15.7.1 and then ran 14.4's setup.exe. Well it worked after installation. Then it asked for reboot.
After reboot it is in code 43 error. HELP ME !!!!!!