linux download
 

Dear sir,

I want to install linux AS4 on my desktop.But i have no cd of linux,if it is possible to download linux.If it possible,please can send that links. Thanks you.

you presumably mean Redhat EL AS 4 (linux is on version 2.6.26 at the moment, no linux 4 for many many years), which isn't available as a free download, and has no place on a desktop either. AS is the highest end distribution for conventional hardware and is for large data centre servers and such. I'd suggest if you want to get as close as you can, use centos 4, it's the same code, but free to obtain and maintain, just rebranded.