Before downloading Microsoft Office 2019 Professional Plus, your PC must satisfy the following requirements
Processor : 1.6 GHz or faster, 2-core / 2 GHz or greater recommended for Skype for Business
Operating System : Windows 10 SAC, Windows Server 2019, or Windows 10 LTSC 2019
RAM: 4 GB RAM; 2 GB RAM (32-bit)
Hard disk drive : 4 GB of available disk space
Resolution : 1280 x 768 screen resolution (32-bit requires hardware acceleration for 4K and higher)
Graphics :
Graphics hardware acceleration requires DirectX 9 or later, with WDDM 2.0 or higher for Windows 10 (or WDDM 1.3 or higher for Windows 10 Fall Creators Update).
Skype for Business requires DirectX 9 or later, 128 MB graphics memory, and 32-bits-per-pixel-capable format.