Question about SC9 installation

Ok. i am going to install SC9.but first…

I already have SC8.1. in my laptop wich is Windows 10 64 bit.

i always used sc8.1 but only now i realize that it is installed in this path: C:\Program Files (x86)\NetMake\v81

First question:
it means that i have installed the 32 bit version of the SC8 right?

Second question:
what now? Since they both (SC8 and 9) will be on the same laptop, should i use the SC9 64 bit installer or the 32 one?

Thanks

ok SC just uploaded this video that totally answers my question
https://www.youtube.com/watch?v=9bwI7LZIaC0&feature=em-uploademail

Thanks