Allows you to disassemble x86-64 code (like inlined WOW64 one) while you using 32-bit IDA database. This would be helpfull to analyze WOW64 mode switches.
In case you use IDA 7 and newer make sure you download and install
capstone for appropriate Python version and architecture, because since IDA 7 by default is 64-bit. You could find the binary installer here
Download the main plugin module
Right click the link -> Save link as...) and save it to IDA