DRFX: Download and double click the .DRFX file to install it.
To install the .setting file text zoom transition, download the .setting files. Copy the settings files to the fusion transitions directory on your computer and restart Davinci Resolve.
PC: C:/Users/%username%/AppData/Roaming/Blackmagic Design/DaVinci Resolve/Support/Fusion/Templates/Edit/Transitions/
MAC: /Library/Application Support/Blackmagic Design/DaVinci Resolve/Fusion/Templates/Edit/Transitions/