Minecraft PC and windows 10 versions?

I just reserved my copy of windows 10 and I'm waiting to get the download. Well I know if I bought minecraft for the PC I get minecraft windows 10 version free. I'm just wondering can I still have the original minecraft installed while having windows 10 installed, or can I only have the windows 10 version installed cause I really want both on my computer?

Win 10 is very buggy for gaming. Be forewarned. System performance is lowered and fps is lowered. Wait for 2 months for a stable version of Win 10.

I can confirm that you can have both simultaneously. Windows 10 isn't anymore buggy for gaming that Windows 8.1. The version released is the stable version. If there are any problems you can easily go back to your previous OS. It's like you never upgraded at all.