Is photoshop cs6 still available and is Illustator files able to be opened in photoshop CC as well as am I able to download Photoshop CC and keep Photoshop CS6?

I have a logo created in Illustrator cs6 but I am afraid that it won't be compatable with Photoshop CC. Is Photoshop cs6 still available for download. Can Illustrator  cs6 files be converted opened in Illustrator CC. I heard there were some conpatablity issues.