Here is a trick on how to install Synaptics Touchpad Driver v17.0.19
> WIN + I
> Change PC Settings
> Update and Recovery
> Recovery
> Under 'Advanced startup' click 'Restart Now'. Make sure to save your work first.
> Select 'Troubleshoot'
> Advanced Options
> Startup Settings and click Restart
> When it boots up, press 7 to Disable driver signature enforcement
> Install Synaptics as you would normally do.
> Restart
If the Synaptics settings does not appear under Mouse properties after completing the preceding steps, try the following
> Open device manager
> Find the touchpad device (“PS/2 Compatible Mouse”)
> Right click on the device and click “Update Driver Software”
> Select “Browse my computer for driver software”
> Select “Let me pick from a list of device drivers on my computer”
> Uncheck the option “Show compatible hardware”
> Under “Manufacturer”, scroll down to “Synaptics”
> Under “Model”, the 17.0.19 driver should appear.
> Select the driver and click next.
> Click “Yes” to the “Update Driver Warning” pop-up.
> Restart
