Download here: https://remoteplay.dl.playstation.net/remoteplay/index.html
System requirements:
PS4™ system
System software version 3.50 or later
Windows® PC
A computer with either of the following operating systems.
Windows® 8.1 (32-bit or 64-bit)
Windows® 10 (32-bit or 64-bit)
Intel Core i5-560M Processor 2.67 GHz or faster
100 MB or more of available storage
2 GB or more of RAM
1024 x 768 or higher display resolution
Sound card
USB port
Mac
A computer with either of the following operating systems.
OS X Yosemite
OS X El Capitan
Intel Core i5-520M Processor 2.40 GHz or faster
40 MB or more of available storage
2 GB or more of RAM
USB port