[technosmurf]

Yeah, that repository's README is a little bit outdated.

Here's what I found works or is broken in macOS Catalina and above:

Works: --------------------

  # Preview source code files with syntax highlighting (like colored .JS files)
  brew install qlcolorcode

  # Preview Markdown files
  brew install qlstephen 

  # Preview JSON files with syntax highlighting
  brew install quicklook-json 

  # Preview plaintext files with unknown extensions, like README, CHANGELOG, etc.
  brew install qlstephen 

  # Preview the content of .IPA files
  # Installs inside /Applications folder
  brew install suspicious-package 

  # Preview iOS/macOS provisioning information for .ipa and .xcarchive
  # For 'mobileprovision' files, Xcode has Quick Look plugin collision:
  # https://github.com/ealeksandrov/ProvisionQL/issues/20
  brew install provisionql 

  # Preview the content of macOS apps
  # Installs inside /Applications folder
  brew install apparency 

  # Preview WebP images
  brew install webpquicklook

Broken: --------------------

  # Display image size and resolution in windo titlebar of Quick Look
  # Doesn't work due to API change from Apple
  # https://github.com/Nyx0uf/qlImageSize/issues/45#issuecomment-610852166
  #brew install qlimagesize 
  
  # Preview Adobe ASE color swatch files from Photoshop, Illustrator
  # Doesn't work in macOS Catalina
  #brew install quicklookase 
  
  # Preview the content of Android .APK files
  # Doesn't work in macOS Catalina
  #brew install quicklookapk

As listed in the README, you also need to unset the quarantine attribute. To see the changes, you need to restart the Quick Look Server after the install, and sometimes requires logging out and in again. Here's a script I made, let me know if it works for you:

https://github.com/spiritphyz/Save-the-Environment/blob/main...