WordPress 2.8.4 Is Available For Upgrade: I Got Error

WordPress 2.8.4 is available for upgrade, we can upgrade it by two methods, by automatically upgrading or by downloading and uploading.

I never tried it by uploading, I always upgraded automatically, so I never faced this upgrading problem but I have listened it is not an easy job. My website is hosted on Bluehost and on Bluehost I did all that job of installing by one click.

I never faced any problem till now when upgrading to a new version but this time when I tried to upgrade wordpress 2.8.3 to wordpress 2.8.4 I got allowed memory error, you can see it in screen shot. So I not tried again. If you also got this error please tell me what you do then. I think it should be a normal error and not going to cause any big problem.