I don't know how to install MLT.

PSC:\Users\Username>melt
Usage:melt.exe [options] [producer [name=value]*]+
Options:
  - attach filter [:arg] [name=value] * Attach filter to the output
  - attach-cut filter [:arg] [ name = value ] * Attach a filter to a cut
  - attach-track filter [:arg] [name=value] * Attach a filter to a track
  - attach-clip filter [:arg] [name=value] * Attach a filter to a producer
  - audio-track | - hide-video Add an audio-only track
  - blank frames Add blank silence to a track
  -chain id [:arg][name=value] *Add a producer as a chain
  -consumer id [:arg] [name=value] *Set the consumer(sink)
  - debug Set the logging level to debug
  - filter filter [:arg] [name=value] * Add a filter to the current track
  -getc Get keyboard input using getc
  -group [name=value] *Apply properties repeatly
  -help Show this message
  -jack Enable JACK transport synchronization
  - join clips join multiple clips into one cut
  -link id [:arg] [name=value] *Add a link to a chain
  - mix length Add a mix between the last two cuts
  - mixer transition Add a transition to the mix
  - null-track | - hide-track Add a hidden track
  -profile name Set the processing settings
  -progress Display progress along with position
  - query List all of the registered services
  - query "consumers" | "consumer" = id List consumers or show info about one
  - query "filters" | "filter" = id List filters or show info about one
  - query "producers" | "producer" = id List producers or show info about one
  - query "transitions" | "transitions" = id List transitions, show info about one
  - query "profiles" | "profile" = id List profiles, show info about one
  - query "presets" | "presets" = id List presets, show info about one
  - query "forms" List audio / video formats
  - query "audio_codecs" List audio codecs
  - query "video_codecs" List video codecs
  -quiet Set the logging level to quiet
  -remove Remove the most recent cut
  - repeat times Repeat the last cut
  - repository path Set the directory of MLT modules
  -serialise [filename] Write the commands to a text file
  -silent Do not display position/transport
  - split relative - frame Split the last cut into two cuts
  - swap Realrange the last two cuts
  - track Add a track
  - transition id [:arg] [name=value] * Add a transition
  - verbose Set the logging level to verbose
  - timings Set the logging level to timings
  - version Show the version and copyright
  - video-track | - hide-audio Add a video-only track
For more help: <https://www.mltframework.org/>

melt—The term 'melt' is not recognized as a cmdlet, function, script file, or name of an operational program.name
Make sure that is written correctly, and if the path is included, make sure it is correct, then try again.
Location line: 1 character: 1
+ melt
+ 
    + CategoryInfo:ObjectNotFound:(k:String)[], CommandNotFoundException
    + Fully QualifiedErrorId—CommandNotFoundException