If VirtualBox has a licensing option that's free for commercial use, I'd go that way for this. I had it installed on my laptop experimentally at my last place and IT's software audit flagged it as not properly licensed, so be aware of the licensing terms. I thought my use was legal, and our IT audit may have been mistaken, but I still had to uninstall it. If you want to use it for current Rockwell software, I would recommend VMWare since that's officially supported. A single license for Workstation Player isn't all that expensive.