Flash Game Download

Yeah, it's pretty likely that there are a bunch of assets you need, and not just the main SWF.  Even then, you're dependent on the content being written in a way where it will find those assets in the adjacent folder, and not always go out to the Internet for them.

It's *also* the case that when running Flash content from the local filesystem, it's possible for malicious content to leak data back out to the network.  For this reason, we disable running content from the local filesystem by default, when running in the browser with current Flash Player versions.  It's also the case that most browsers won't just let you drag a SWF from the local filesystem into the browser anymore.  I generally recommend that people run a local webserver instead of trying to just run the content from the filesystem, for numerous reasons.

So, can you do this?  Maybe.  It's not going to be trivial, and depends completely on how the content was authored.  You'll have to do some reverse-engineering.

At minimum, you'll probably need to use your browser's developer tools or another debugging proxy to identify all of the assets required when the game is operating, retrieve them individually and put them in the appropriate directory structure.  At that point, if you're lucky, the game will load everything from relative paths and work normally.  If it's relying on multiple servers on the backend, it gets more complicated.