First of all, the port for downloading software is not fixed now. You certainly don't know what port, you can't limit it.

Online videos are all in the form of www pages, based on the HTTP protocol, that is, port 80, but normal browsing pages are also in this port, which cannot be blocked.

This is the best way to limit the ip speed on the router. This is a qos function.

There are also hardware devices for online behavior management, which belong to the 7-layer architecture. In the application layer, you can identify the specific content of data packets and distinguish application software, but this kind of equipment is more expensive.

I suggest you use the qos of the router to limit the speed.