The NI-CAN driver only works on the 32-bit version of LabVIEW. The 64-bit version is not supported.
You can read more about the supported software in the NI-CAN driver's readme file, which you can find in the download page for each version of the driver: Download NI-CAN
If you want to use CAN, LIN, or FlexRay communication in LabVIEW 64-bit, you can use NI-XNET. The NI-XNET platform combines a series of high-performance CAN, LIN, and FlexRay interfaces with the NI-XNET API, which is a common set of easy-to-use functions for reading and writing CAN, LIN, and FlexRay frames and signals in many different platforms including PXI, PCI, NI CompactDAQ, and NI CompactRIO. Refer to the following guide to migrate your applications to this new driver: Migrating NI-CAN Applications to NI-XNET
Please note that not all hardware is compatible with the NI-XNET driver. You can read more about the supported hardware in the NI-XNET driver's readme file, which you can find in the download page for each version of the driver: Download NI-XNET
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