Red Rabbit

It seems that this problem is widespread. After researching the net for hours and hours I found an advice to use FSUIPC v. 4. for FSX. Now here is my problem: Installed FSX/ Acc.( DVD Version) on a clean SSD with windows 10 64Bit. Installation without any problem, even registration worked. (PartMgr problem in Reg. was corrected before.) MS Sidewinder FFB pro with LUFA interface , that I used for years with FS9 and worked just fine, could be calibrated with all axes including throttle and all buttons. FSX sees all axes and programmed buttons, but does not see the throttle. An here it comes, my registered version of FSUIPC v 4.9 for FSX does not read the throttle either. I can not make it read the values. Could you give me an advice please, where to look and what to look for, because using F1-F4 is not very practible, you never know where the lever is. Regards Hans