Bluemaxima's Flashpoint is an ongoing project that preserves games and animations that were made in Flash [and other platforms as well] for free, offline.
To get started, follow the instructions.
Download Flashpoint
go to BlueMaxima's Flashpoint and click on Download.
Download Flashpoint Infinity [unless you want to download the 400+ GB Ultimate version, which you don't]
download the ZIP file and extract it.
Then, open the folder you just made, and double-click Start Flashpoint.
That's it!
You downloaded FP!
And you get to play around the archive.
Also, you need an Internet connection the first time you start a game.
The second time you load a game, you don't need Internet. Also, if your firewall tries blocking anything, allow it, because some Flash games were made so that you couldn't play it on anything but it's dedicated site, and this thing is simply what tricks it into thinking it's on the website. Also, it's malware free.