Free H.264 MVC 3D Encoder

I need some help with FRIMSource64(), please.
My working enviroment: Windows 10, FRIM version 1.29 (x64) (Avisynth+ (Intel Media SDK 2018 R1))
I'm trying to pipe .h265 video to x265.

>avs2yuv64 -frames 24 -raw -depth 10 -par 1:1 encode_Mission_Impossible.avs -
encode_Mission_Impossible.avs
LoadPlugin("C:\Programs\AviSynth+\plugins64+\FRIMSource64.dll")
FRIMSource64(codec="h264", filename="F:\Mission_Imposssible_Ghost_Protocol\Mission_Imposssible_Ghost_Protocol.h265", cache=1, num_frames=24)
The result is:
error: Script error: There is no function named 'FRIMSource64'.
(encode_Mission_Impossible.avs, line 2)

The requirenment for libmfxsw64.dll to be "placed in any directory which is specified in PATH environment variable" is fulfilled - it is in two directories.

What can I do about this?
Thanks.