I don't get it - why the change ?
It used to be up to 3 workplaces, if I'm not wrong.
This license may only be used by a single employee at your company and any additional employees must purchase their own licenses.
FileMaker understands and recognizes that developers will often have the need to use the software on both a Mac and a Windows based desktop computer to develop and test their cross-platform FileMaker solutions. So, as a special benefit for members of the FileMaker Business Alliance, FileMaker allows such members to use a single licensed copy of FileMaker Pro Advanced software for their own exclusive internal use on both a Mac and a Windows based computer in lieu of their Home/Portable Use rights described above. You may not use both copies of the software concurrently.
so I seems can't use it on my portable and on my iMac at the same time anymore.