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#21
At the bottom of that page I posted the link to, there is a link to the index, which is a text file. Click that link and look in the list under the SP1 Media Refresh section. Find the number for whatever version you need, and download the corresponding ISO from the previous page. The Pro versions for SP1 english are xt-59183 which is 32 bit, which is fine, and xt-59186 is 64 bit, that one is corrupt. You can download a different version, such as home premium, and use Rufus to create a bootable usb. Rufus can be found here. After you create the bootable usb, open the "sources" folder and delete the file named "ei.cfg". When you install from the usb, you will be prompted for which version you'd like to install.