OK, so you did a Director upgrade and it's telling you that you have an invalid executable? Well, there are about half a dozen very similar error messages that all reference an invalid executable.
There isn't a special version of the Director for your version of Windows. One version of the Director runs on all versions of Windows (and on Linux and Mac using Wine but that's a different story).
What's happening is the Director is trying to download the new version of itself but something is getting in the way. 99% of the time, it's one of those dumb Windows firewall things that decided that http://sumrandomguy.com isn't big enough so they are protecting you from my site. Director tries to download its upgraded version but the firewall blocks it and says "Nope. Not gonna let you do that." The Director creates a new file with what it just downloaded so now instead of a new file with the Director in it, it's got a new file with "Nope. Not gonna let you do that." which, obviously, isn't a valid Windows application.
Tell your Windows firewall to be nice to the sumrandomguy.com website. I don't know how to do that, you're the one running the thing and it's yours. You have to figure it out. I don't run them because they offer absolutely zero benefit and tons of problems (such as this one).
"Invalid Executable" means "Your firewall is a big fat meanie."