I would recommend downloading 1.5.2.1 as we are still beta testing the latest one at the top Just click on the green button and it should ask you to save the file automatically, save as, and then you need winrar to unzip the files.
I was able to download on my phone, when I transferred it to the computer and unzipped it all I get is a .tmp file. So I figured it may be an issue with downloading on the phone. I used teamviewer logged into my computer at home downloaded the wallet then transferred to my computer here at my office and I still get the same .tmp file when I unzip. When I open it in 7zip it shows the Hyper-qt.exe file but that is not what I get when I unzip it.
I finally figured out that Avast was blocking it for win32:Evo-gen, so I had to turn of Avast temporarly unzip it then add it to Avast's exclude list.
So I have the wallet up and running now, syncing with network.
That's unusual no one else has reported an anti-virus false positive with any of the HYPER wallets.
You definitely downloaded the wallet from: https://github.com/palmd/Hyper/releases ?
Please confirm ASAP where you downloaded the wallet from.