Installing the ACT Web Client on a Linux based Operating System is recommended. Linux fully supports the ACT code base.  With Linux, there are no server side code modifications needed. At Partners, we are running
Linux 3.10.0-693.11.6.el7.x86_64

Installing the ACT Web Client on a Windows server will require PHP code changes. Code areas affected would be, job scheduling, working directory access, and others.

If you only have a Windows server, and you are running Docker Engine, consider using our Docker package. ACT Docker Install