Wordpress 2.63 upgrade

[ShaneFalco]

I use Hostgator as my hosting company. I install wordpress 2.61 using the fantasico interface. I want to up upgrade to 2.63 however they have the following message:

PLEASE NOTE:

If you have modified the files, languages, themes or if you have added any third-party modifications to this installation of WordPress, it is possible that you may need to re-install your themes and/or reaaply your custom changes after using Fantastico to upgrade. We take no responsibility for the integrity of custom modified installations after Fantastico upgrades them. We recommend that you make your own backup of your database and script directory before proceeding even though Fantastico will automatically make one before upgrading.


Info: Your current installation will be backed up.


Click on Upgrade in order to proceed.
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Does anyone have experience with this? Will I lose change to my revolution sports theme?