To get a full version of Winrar version 3.80 for free

1. Go to the Registration page Here

2.  Enter the values (First Name, Last Name, Email address, confirm Email address)

3. Check the check box and click the button.

4. Check your mail

5. Mail will have two links use the second link to download the key file.

6. Get the WinRar 3.80 from here

7. Install it

8. Double click on the key file “rarkey.rar” to register.

Now it is accepting only German IPS so you may need a German proxy, like http://unblockbypass.com/

Read more here