Install on 64 bit machine?

Will the  Live/Install CD on this page linuxcnc.org/docs/html/getting-started/getting-linuxcnc.html work on x64 machine? Will I be able to compile Lcnc from source on Bebian running on x64?

Yes, it is for 64 bit PC.
It does not work on a 32 bit PC
Yes, you can compile LinuxCNC on it, although it is already installed.
And yes, you can have the installed (buildbot) version and a Run In Place version on the same PC/installation.

Thank you.
What would be my options if I have 32 bit computer?

About the Debian version on this link www.debian.org/CD/live/ Is it already have Linuxcnc with it?

sam2004 wrote:

About the Debian version on this link www.debian.org/CD/live/ Is it already have Linuxcnc with it?

No this does not have LinuxCNC.
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For 32 bit PC use the Wheezy version from here
linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
Edit:
Be aware this version and Debian Wheezy are not supported any more, they are very old.