GX Works2 does not support the ACPU modules.
Use GX Developer for the ACPU modules.
GX Developer is included on the CD-ROM of GX Works2.

For the installation procedure, refer to the following manuals.

GX Works2 Version 1 Operating Manual (Common)
Model code: 13JU64
Appendix 14 Procedure to Use GX Works2 Unsupported Programmable Controller Type