How can I change my yahoo mailbox to older version?

Assalamualaikum brother fazil, "Beginning the week of June3,2013, older versions of Yahoo! Mail (including Yahoo! Mail Classic) will no longer be available.
After that, you can access your Yahoo! Mail only if you upgrade to the new version. 
When you upgrade, you will be accepting our Communications Terms of Service and Privacy Policy.
This includes the acceptance of automated content scanning and analyzing of your communications content" However there is a possibility that if you can check with the yahoo free mail service.
they may have an option to switch to classic view manually