Finding an official "2019" version of Power Geez is difficult because the software is older proprietary tech. Most users are actually looking for Power Geez 2010 Power Geez Unicode
For modern Windows, using Keyman provides the best experience. Download Keyman: Download Keyman Desktop from the official site. Install Keyman: Launch the Keyman setup file. Install Power-G Keyboard: Open Keyman Configuration. Click "Install Keyboard." Search for "SIL Ethiopic Power-G" and install it. power geez 2019 setup link