Before you delete anything, back up your DAW projects. While the legitimate version of Omnisphere 2 should technically load the same presets used in a cracked version, "wrapped" or highly modified pirate versions can sometimes cause "Plugin Not Found" errors.
Here is the step-by-step path forward if you currently have a cracked version but want to go legit: How To Upgrade Cracked Omnisphere To
Manually save any custom patches or "User" folders found in your current directory to an external drive. Complete Uninstallation: Before you delete anything, back up your DAW projects
Here's a step-by-step guide to upgrading your cracked Omnisphere: Before you delete anything
Here is everything you need to know about moving from a cracked version to a fully licensed, professional setup. The Reality of Upgrading a Cracked Version