I use this to install/update my zen browser on linux, it uses the AppImage to launch

update-zen-browser.sh

#!/bin/bash

# Makes sure the Applications directory is available
mkdir -p "$HOME/Applications"

# GitHub Repository Details
OWNER="zen-browser" # Replace with the repository owner
REPO="desktop"      # Replace with the repository name

# Local file to be replaced
TEMP_FILE="/tmp/zen-browser.AppImage"
LOCAL_FILE="$HOME/Applications/zen-browser.AppImage" # Replace with the path to the file you want to replace

# Check if a specific version tag was provided
if [ -n "$1" ]; then
  VERSION="$1"
  echo "Using specified version: $VERSION"
else
  # GitHub API endpoint for latest release
  RELEASE_URL="https://api.github.com/repos/$OWNER/$REPO/releases/latest"
  VERSION="$(curl -s "$RELEASE_URL" | jq -r ".tag_name")"
  echo "Using latest version: $VERSION"
fi

# Download the file to temp dir then moved to ~/Applications
DOWNLOAD_URL="https://github.com/$OWNER/$REPO/releases/download/$VERSION/zen-x86_64.AppImage"
echo "$DOWNLOAD_URL"
curl -L -o "$TEMP_FILE" "$DOWNLOAD_URL"
mv "$TEMP_FILE" "$LOCAL_FILE"
chmod +x "$LOCAL_FILE"

# Check and create .desktop file if it doesn't exist
DESKTOP_FILE="$HOME/.local/share/applications/ZenBrowser.desktop"
if [ ! -f "$DESKTOP_FILE" ]; then
  cat >"$DESKTOP_FILE" <<'EOL'
[Desktop Entry]
Name=Zen Browser
Comment=Experience tranquillity while browsing the web without people tracking you!
Exec=$HOME/Applications/zen-browser.AppImage %u
Icon=$HOME/.local/share/icons/ZenBrowser.png
Type=Application
MimeType=text/html;text/xml;application/xhtml+xml;x-scheme-handler/http;x-scheme-handler/https;application/x-xpinstall;application/pdf;application/json;
StartupWMClass=zen-alpha
Categories=Network;WebBrowser;
StartupNotify=true
Terminal=false
X-MultipleArgs=false
Keywords=Internet;WWW;Browser;Web;Explorer;
Actions=new-window;new-private-window;profilemanager;

[Desktop Action new-window]
Name=Open a New Window
Exec=$HOME/Applications/zen-browser.AppImage %u

[Desktop Action new-private-window]
Name=Open a New Private Window
Exec=$HOME/Applications/zen-browser.AppImage --private-window %u

[Desktop Action profilemanager]
Name=Open the Profile Manager
Exec=$HOME/Applications/zen-browser.AppImage --ProfileManager %u
EOL
  # Replace $HOME with actual home path in the file
  sed -i "s|\$HOME|$HOME|g" "$DESKTOP_FILE"
  echo "Created desktop entry at $DESKTOP_FILE"
fi