Detects the 64-bit system automatically, downloads the matching package, and creates the alpha-qrcode command.
arch=$(uname -m); case "$arch" in x86_64|amd64) package=tar-x64 ;; aarch64|arm64) package=tar-arm64 ;; *) echo "Unsupported 64-bit architecture: $arch" >&2; exit 1 ;; esac; curl -fL "https://alpha-qrcode.com/desktop/download/linux/$package" -o /tmp/alpha-qrcode.tar.gz && mkdir -p "$HOME/.local/opt/alpha-qrcode" "$HOME/.local/bin" && tar -xzf /tmp/alpha-qrcode.tar.gz -C "$HOME/.local/opt/alpha-qrcode" && chmod +x "$HOME/.local/opt/alpha-qrcode/AlphaCrossAvalonia" && ln -sf "$HOME/.local/opt/alpha-qrcode/AlphaCrossAvalonia" "$HOME/.local/bin/alpha-qrcode"