Ensure that the folder structure and drive letter (C: D: etc) are same on the new computer also. Then you will be able to simply copy all RecentX data files to the new computer which will include all your tags.
Here is how you access RecentX data: Open the folder %appdata%\Conceptworld\RecentX in Windows Explorer (File Explorer). To do this, copy this path %appdata%\Conceptworld\RecentX and run from the start menu or open in Windows Explorer.
Here is where all data files are stored.