Sizes and hashes are available
on Calibre's Google code page. You should always download only from the official Calibre page, which links back to the Google code download, or the alternate mirror on the official page, which links to the
Sourceforge project page.
Could you be a little more specific as to the meaning of "hangs"? What does it say it's doing when you think it hangs (no screenshot necessary, the text should suffice, I believe)? The installer has been known to spend quite some time at the stage where it's checking free space, although that has been drastically improved some versions ago. Also, with recent changes to the installer, it might have become a little slower again.