WELP, I think what you need to do is download that beta version of Dev-C++. Then you can use the built-in package manager thinger to download the SDL devpack specifically for it. It's not the most up-to-date version of SDL, but it'll work fine for what you're wantin to do at the moment. It even installs an SDL template, so when you create a new project, you can select that, and it'll have a bunch of barebones code for using it. I hadn't used that method though for an actual project, but I assume it works if they put it there.