so you need python - a full install, and git. Doesn't matter OS. python venv (virtual environment) ensures that this folder, once it works, is locked to all the versions inside it, including the python version. this works for any software that uses pip to set up, or any python stuff in general.

  git clone <whisper-diarization.git URL>
  cd whisper-diarization
  python -m venv .
  cd scripts
  # and then depending on your OS it's activate.sh, activate.ps1, activate.bat, etc. so on linux [0] 

your prompt should change to say

(whisper-diarization) <your OS prompt>$

now you can type

  cd ..
  pip install -c constraints.txt -r requirements.txt
  python ./diarize.py --no-stem --suppress_numerals --whisper-model large-v3-turbo --device cuda -a <FILE>

next time you want to use it, you can just do like

  cd ~/whisper-diarization
  scripts/activate.sh (or whatever) [0]
  python ./diarize.py [...]

[0] To activate a Python virtual environment created with venv, use the command

  source venv/bin/activate 

on Linux or macOS, or

  venv\Scripts\activate 

on Windows. This will change your terminal prompt to indicate that the virtual environment is active.

(the [0] note was 'AI generated' by DDG, but whatever, linux puts it in ./bin/activate and windows puts it in ./Scripts/activate.ps1 (ideally))