I've noticed that it's pretty hard to find a download for the latest version of Google Chrome for Windows XP & Windows Vista. Even though I don't usually use Chrome, it's not uncommon for me to have to re-install Windows for someone who does. And sometimes, it just so happens that I need to re-install Windows XP or Vista for someone who uses it as their primary browser. I've had to do this enough times to where I decided that enough was enough, and that I was going to spend the majority of an afternoon looking for an untouched installer for Chrome v49.0.2623.112 (the very last version to support Windows XP and Vista). After quite a bit of searching, I managed to hunt down untouched 32-bit and 64-bit installers (I verified their hashes, so they're the real deal).
I also figured out how to install Chrome for all users with them via command line. So, to install for only the current user (to AppData) you'll want to just run the appropriate EXE for your system. If you'd like to do a system install (to Program Files) you'll want to run its batch file counterpart.
Unfortunately, I have not yet been able to find the Enterprise (MSI) installers, but I'll keep looking, and I'll update here if/when I do. Edit 10-7-2017: I have finally found the Enterprise installers. A download link has been added for them. I also updated the download for the standard EXE installers to include proper MD5 and SHA1 files.
Good news everyone. I have finally found the Enterprise installers! A download link has been added to my first post. In addition, I have also updated the download for the standard EXE installers to include usable MD5 and SHA1 files.