There are a number of UART drivers which had been brought to market by Silicon Labs. Below you will find the most common UART drivers which are downloaded from the internet. Like any other software it is best to check your version of your driver first before you install another. If this is newer then the software will simply over right the current older driver.
You can also search this website for the FT232R USB driver which is another driver which you can view. There is also a good explanation in how to setup the drivers for the UART. Read that for more guidance.
Silicon CP210x USB to UART Bridge VCP Driver 6.5.3
This is a very old piece of equipment however it is still in use today. This updated driver fixed a memory leak in the earlier software for the hardware. The driver also fixed the BSOD corner case for a write cancellation on the equipment. There was also a bug fix done as the update of the software did not always update correctly. Below is the Windows version as well as a Linux version. Note that tis driver was released in 2012.