Re-download Mountain Lion?

How do I re-download Mountain Lion or should I?. Currently I run Snow Leopard 10.6.8 and iTunes 11.1.2 on a Mac Book Pro Early 2011. I purchased OSX Mountain Lion 10.8.2 back in 2012. Only to discover I could not use some much needed software for work. So I had it uninstalled/downgraded. I am now ready to upgrade my OS. Questions: a) How can I re-download the previously purchased Mountain Lion? I find it in my purchase history on iTunes, but it does not give me an option to download. I did not receive a disc. b) Should I or can I just purchase a newer OS Yosemite/El Capitan? Thank you.

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