python- selenium- click on arising link

I am using selenium library for python and chrome browser.

I need to click a link from the url:

http://www.youtube-mp3.org/

The idea is to download a list of videos converted to mp3 files in a previous code. My script is:

from selenium import webdriver
from selenium.webdriver.common.keys import Keys

import time
url2='http://www.youtube-mp3.org/'

chromedriver = 'C:\\exp\\chromedriver.exe' #where you have the file
browser = webdriver.Chrome(chromedriver)
browser.get(url2)

direc = browser.find_element_by_id("youtube-url")
direc.clear()

direc.send_keys("https://www.youtube.com/watch?v=nYh-n7EOtMA") #an example url
browser.find_element_by_id("btns").click()

Until here everything is ok.

Now I need to press the download link that appears after the video is converted.

The html for that part is:

   <div id="dl_link" style="display: block;">
    <a href="/get?video_id=nYh-n7EOtMA&amp;h=-1&amp;r=-1.1" style="display:none"><b>Download</b></a>
    <a href="/get?video_id=nYh-n7EOtMA&amp;ts_create=1463533555&amp;r=MTg2LjYwLjE2MS4yMTE%3D&amp;h2=5ad90182ae65fea567f844c3b6a933aa&amp;s=145334"><b>Download</b></a><a href="/get?video_id=nYh-n7EOtMA&amp;h=-1&amp;r=-1.1" style="display:none">
  <b>Download</b>
 </a></div>

But I can only see it when I select "inspect object", because if I select "view source code" (after I pasted the url and the video and link appear), there's nothing in it.

I tried with:

browser.find_element_by_partial_link_text("create").click()

But I got an error:

NoSuchElementException: Message: no such element

and also with:

browser.find_element_by_name("dl_link").click()

error:

NoSuchElementException: Message: no such element: Unable to locate element: {"method":"name","selector":"dl_link"}

and also with:

browser.find_element_by_id("dl_link").click()

and got:

ElementNotVisibleException: Message: element not visible

So, my questions are:

1. why I cannot see the html script for the download link when I press view source code?
2. is it possible to finish the process (downloading the mp3 file) with python?
3. does the fact that the web page has java scripts in it is related to the issue?
4. is there any other library to do this?

thanks.