How to replace Android's Download Manager by an other default app? I got enough of the poor functionality of com.android.providers.downloads 

So I decided for a better alternative download manger.

But how can I choose the alternative as preferred download manager? My alternative download manager is listening to my clipboard. But this does not help me, because not all addresses to online files can be easily copied into Android's clipboard.
If you happen to have Android version above 5.1 and familiar with command line interfaces, then you could use termux. It has a built in binary wget to basically download anything. Just put wget https://whateverlink.exe and it will start downloading it. All you'll be needing is the link to download the file you want to download. The built in download manager being a system app, is actually a system wide download manager for all the gui interfaces on the device. If you happen to have root privilege, and try doing pm -k uninstall 0 com.android.providers.download and pm uninstall -k --user 0 com.android.providers.download.ui(you can also do this with adb). What this will do is, uninstall download manager, but will be availbale like before if phone is disabled, (also if you like to play it safe and have root, better to perform pm disable com.android.providers.download, in this way you can enable it anytime with pm enable com.android.providers.download).Now with uninstalled/disabled, if you try downloading something on your browser, you'll see that download fails. Even with a third party download manager, because everything downloadable on gui apps uses the built in Download manager. However, termux uses binaries wget to download stuffs, hence doesn't need a download manager becuase it has its own libraries and binaries writen to download. Yep, there you go. You can find termux on Google Play Store. To download wget, just type in pkg install wget on the command line, and it'll download wget for you. From then on you could use wget https://pastelinktodownload to download. Although termux is way more than just a simple download manager. Enjoy! Hope this helps (: