FileMaker 11 is no longer supported by FileMaker Inc., so they have not written patches to keep it working with newer operating systems. Windows Server 2003 is no longer supported by Microsoft either. Basically, you will have problems getting any newer computers with new Operating Systems to work with an older system like that. If you must do it, you will need to get an older version of the Mac or an older Windows machine. One weird possibility is to run a virtual instance of an older Windows operating system on the Mac such as with VMWare or Parallels.
By the way, she can try FileMaker Pro 11 on her Mac. I'm just not sure it will install. But if it does, she is good (well, can't be sure all features are running correctly, etc.). FileMaker's licenses are system agnostic. So if you have a Windows license, that same number will work with a Mac version. You just need the Mac installer.
Perfect! Another concern I have, possibly all licensed are utilized by Windows clients. Is it still possible to buy license for latest FMPA and use it for FMPA 11? If yes, where to buy? And the installer, do you have links where to download a client for Mac?
Bill, FileMaker will only see current licenses. However, if you have a current license that is valid, you can get them to send you an old license number to use instead. I'm afraid I only know the sales contacts for here in the USA, but I do know FileMaker has reps that can help you in Chinese. Maybe if you go to the FileMaker store, it will give you the Chinese contact info since you are in China. But, yes, you will need to contact them to get the former FileMaker 11 license issued.
See if this person can help you out: https://www.crunchbase.com/person/lucy-chen#/entity