Almost every non-budget machine has been 64-bit capable since 2007 or so (Core 2 Duo).

That said, there are plenty of 32-bit OS installs out there.

I didn't mean my comment to be judgemental. Just a heads up that there are no 32 bit builds.

(I for one happen to run 32-bit Ubuntu on a non-budget, 64-bit capable machine, hence the comment)

Yeah but for Linux desktops? You can safely assume that a modern Linux desktop installation is 64bit these days. (Actually for years.)

I wouldn't. Ubuntu, arguably the most common desktop distribution, just started using 64-bit as a default last year with 13.10.

Seems to be a trend, even XCOM was only available for 64 bit processors.