It is advised to disable these add-ons from Chrome before proceeding the download.
If the problem was being caused by them, it would be solved.
Sometimes, servers in a specific region may be overloaded or may be going through a hardware failure.
The Steam content system is divided into different regions.
The client automatically detects your region through your network and sets it as default.
Although Steam has collaborated with most of them so they don’t give problems, sometimes they do.
The solution is to disable/uninstall them and check if you are able to download.
This doesn’t only include the Chrome extensions, you should disable ANY program which is related to your network (data monitor, VPN’s etc.) It is better to try rather than proceed with the further solutions which are more complex.