Hi,
The update is optional. If you decide to install the latest software version covered by your license, I suggest contacting the NCH technical support team for assistance:
https://www.nch.com.au/support/index.html
Regarding the issue you are facing with the noise, try to play those files locally on your computer (you can try VLC Media Player) and check if the same issue occurs.
If the bar is orange instead of green, you may have just changed the color of this track. To switch it back to green, simply click on the color box on the track and you will see various options to choose from. I have attached a screenshot for reference. https://files.fm/u/mr594v665x