Answer
The installer for the 64Bit version of each product installs only the 64Bit version of the ActiveX library. If you want to compile a user application that incorporates the IPLink client library in 64Bit, you need to install both the 32bit and 64Bit versions in the development environment. If you want to compile your user application with IPLink client library in 64Bit, you need to install both 32bit and 64Bit versions in your development environment.
If you want to run an application that has already been compiled in 64Bit on a PC different from the development environment, you only need to set up the 64Bit version of the IPLink library.