About a year ago I bought a USB to VGA Adapter from Insignia (https://www.insigniaproducts.com/pdp/NS-PUV308/6138366). I no longer use this Adapter and would like to remove the drivers because sometimes the drivers can use up to 70% of CPU, but can't find a way to remove the drivers.
Usually drivers come with an uninstaller. Redownload the installation package/dmg of the driver if necessary and use the uninstaller included there.
In the specific case, the driver can be redownloaded from the web site linked in the question.
It contains both an installer and an uninstaller. From looking at it, the following files get removed
/Library/Audio/Plug-Ins/HAL/MCTT6Audio.driver /Library/Extensions/MCTTrigger2.kext /Library/Extensions/MCTTrigger6USB.kext /Library/Extensions/MCTTriggerGraphics.plugin /Library/Extensions/Trigger5Core.kext /Library/LaunchAgents/com.mct.USBVGASync.plist /Library/LaunchDaemons/tw.com.mct.TriggerDriver.plist /System/Library/Extensions/MCTTrigger2.kext /System/Library/Extensions/MCTTrigger6USB.kext /System/Library/Extensions/MCTTriggerGraphics.plugin /System/Library/Extensions/Trigger5Core.kext /System/Library/Services/USBVGASync /usr/local/libexec/MCTTriggerDriver /usr/local/sbin/USBVGASync
After removing the files a restart is required.