I can't run the newest version of x265 (3.2.1+1-b5c86a6) in Simple x264/x265 Launcher v2.94 (2019-10-05), it complains that it's a too old version of x265.
Also, there is a newer version (not any important feature, but it's compiled with a more newer compiler) of Avs2YUV released than is included in that package,
http://avisynth.nl/index.php/Avs2YUV
Thanks.
EDIT: Thanks for the advice redbtn.