Microsoft Office 2010 - have product key but not correct email

Ok so I'm planning on re-installing Windows, which means I need to download Office 2010 again. However, I simply can't find the correct email that Office is tied to. I've tried the only 4 emails of mine it could possibly be tied to to no avail. The computer/Office were a gift from my parents for graduation, but their work/home emails don't have an account tied to them. So I'm at a loss.

I ran into this problem before, trying to switch from click to run to MSI. However, I was able to work around it by, I think, downloading the 30 day trial or whatever, and activating from there. However, I can't seem to find a 2010 trial anymore. A Google search for it takes me to where it would be, but then I click on "try it now" (as seen here Try Office 2010 - Microsoft Office) (Home and Student version, if it matters), and it redirects me to the new 2013 version, which obviously isn't what I want.

Any thoughts on how to work around this? I could always try customer service, I guess, but if there's some alternate source to get the trial from that would be great. Thanks.

Edit: Also, I really want it to be the MSI version, not click to run, so I think that would affect what to download. Thanks again.

Just what I was looking for. Thanks! :)