How to Download Patchset or Opatch from metalink

Update:
If you are using latest support.oracle.com then after login to metalink Dashboard
- Click on Patches and Updates tab
- On the left sidebar under "Oracle Server/Tools" click on "Latest Patchsets".
- A new window will appear.
- Just mouseover on your product in the "Latest Oracle Server/Tools Patchsets" page.
- Corresponding oracle platform version will appear. Then simply choose the patchset version and click on that.
- You will go the download page. From the download page you can also change your platform and patchset version.

To download patchset as well as logon to metalink you must need a MetaLink account. To register for MetaLink, you will need a valid Support Identifier (CSI). To have an account go to https://metalink.oracle.com/ and select Register For MetaLink under First Time Users. Then give your CSI number Support Identifier Country and click proceed. After that follow instruction as indicated.

After you have your metalink account you can downlaod patchset or Opatch from metalink. Steps are stated below.
1)Login to metalink with username and password.

2)Beside quick find drop down menu select Patch Number.

3)Beside this box there is another box where you can give the patch number if you know the patch number previous. It is an integer number. For example,
-If you try to get patchset 10.2.0.3 then give number as 5337014 and click go. In order to know the patchset number just have a look at, List of Patchset number in metalink
-New pop up windows will appear. Enter again username and password.
-Select you platform from drop down menu and click download.
-You have finished download in this stage.

4)If you don't know patch number and you wish to find it out then simply click go.
5)Patches & Updates page will appear. From it you can proceed as you like.