Keey in mind, the latest versions of astro are veery much a headache themselves =p
And if you can use the stock browser you can download apks.. if this is what you cannot access, you would have to find some sort of app store, usually its the "play store" or possibly the "market". Please keep in mind that the market apps are needing you to sign into your gmail account, so keep this is mind while attempting to use them.
Best of luck!