Q:

How to download bitaddress.org to use offline?

The site does not have a download option.
I can save the page using Google Crome by CTR-S, but the version I have saved in this way does not work.

A:

It is better to download the actual code from:
https://github.com/pointbiz/bitaddress.org
(this link is from the bitaddress.org site, no need to trust me :-)

Click the "Download ZIP" button.
Restart your computer. **
Make sure you do not have an internet connection enabled (WIFI disabled, Ethernet unplugged).
Open the zip file.
Open Chrome or Firefox.
Drag the bitaddress.org.html file into your browser.
Make your paper wallet using a complex, but impossible to forget password.  Ideally it is 16+ characters + numbers and punctuation.  You might want to write this password somewhere so it is impossible to forget, but then you are opening up another potential attack surface to be careful.
Make several prints (do not save a copy anywhere on the computer).
When done, close the tab and clear your browser cache and delete the printer spool file.**
Restart the computer to clear all memory, etc.

** For extra security, boot from a Linux LiveCD so that any trojans, viruses, key-loggers, etc you have on your "normal" computer are not able to interfere with the paper wallet creation process.
More good security tips here: https://bitcoinpaperwallet.com/#security

