[HELP] Downscaling/Resizing to ProRes 444: The Journey Begins

[Apprentice]

Yeah, I figured as much, but I thought I might as well give the newest version a try anyways. Thanks for working on it as long as you did. I'm running High Sierra, if that matters.
Your command gives me this:

[Parsed_mergeplanes_3 @ 0x7fd4f86357c0] input #1 link in1 SAR 15:16 does not match output link default SAR 1:1
[Parsed_mergeplanes_3 @ 0x7fd4f86357c0] Failed to configure output pad on Parsed_mergeplanes_3
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!

I thought it might be the dimensions being different (4096 instead of 3840) so I tried it with regular UHD to fullHD 16:9 and it gave me

Unrecognized option 'sn '.

I realized there was an extra space after 'sn', not sure if it was supposed to be there or not but I removed it, put it into Terminal, and it finally went through the process. But at the end it said: 

Filter zscale has an unconnected output

and exported a 0KB unopenable .mov file to my desktop. (Quicktime says the file cannot be opened.)