To update VMware Horizon Client, please
1. Running the VMware Horizon Client
2. At the right up corner, please clicking "..."
3. Then select "Software Update"
4. Follow the steps until it is completed.
For detail, please refer to the video:
https://share.vidyard.com/watch/RvPHWd65gt317dqM7umPU8?
https://youtu.be/1BzE5zc7acU