If the game is only on Steam, install Linux on a VM, install Wine in it, run SteamCMD through Wine, download the build you want, and move to your host OS.
SteamCMD is a minimalist/terminal-based version of Steam. The Windows version can be downloaded separately. However, it downloads needed libraries and I'm not sure how good Steam is at escaping Wine's environment, so a VM adds an extra security layer. Also the command changes depending of whether it's 32-bit or 64-bit, if it's for Linux, MacOS or Windows, or even if it's a previous, still public update, and it's been some years since I used those and I don't have the commands noted down, so can't help with that at least right now.