How to get Snapchat on my old phone again?

So I have a Samsung Galaxy S, the first one. Yes, I know it's ancient, but I can't upgrade for another long while now. I had Snapchat on it for about 2 or 3 years, and it worked fine. All of the sudden, about 8 months ago, I opened Snapchat, and it force closed. When I opened it again, it had me log in. I put in the correct credentials, and then it gave an error message, saying that my device is too old to use this version of snapchat, (even though I had been using it for a long time,) and that I needed to update. There is no way for me to get it through the Play Store, because when I go there it says my device isn't compatible for Snapchat. My Galaxy S1 Vibrant for T Mobile is running on 2.3.3 Gingerbread operating system, and what I'm really asking is if there is another place where I can download the old version of Snapchat that IS compatible with my device, where that is, and which is the exact correct one for my phone. I have been DYING to use Snapchat, so please get back to me ASAP.

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