Uninstall Realm Works; you currently have 245 (the last 32-bit only version) installed. If you had both 245 and a newer version installed (during the "beta" period), make sure you've gotten rid of both of them.
If you have any leftover pinned icons or tiles, unpin them. If you have any leftover other shortcuts, delete them.
Download and install the current version of Realm Works. As of this post, the version is 250 and it works on both 32-bit and 64-bit machines.