Crack javascript

[4]

Hello, I have a request. Do any of you know javascript? I would like to find a way to read entire newspapers for free from a certain side. Could someone write javascript code to trick a page and display access to an entire issue of a newspaper? If the newspaper is not purchased, the truncated base.xml is shown and after purchase this file shows access to the entire newspaper. How do I get around it?

Side:

Show ContentSpoiler:

https://www.e-kiosk.pl/secure/webreader/index.php?id_issue=389419&&e=index.php%3Fpage%3Dfile%26id_issue%3D389419%26file%3D&cart=../index.php%3Fpage%3Dbasket%26id_issue%3D389419%26ewydanie%3Di&link=../../numer,389419,przegl_d_sportowy&demo=true&back=../../numer,389419,przegl_d_sportowy

Show ContentSpoiler:

https://www.e-kiosk.pl/secure/webreader/index.php?page=file&id_issue=389419&file=/base.xml

Only three pages in .pdf can be downloaded. There is a way to download the whole, or 24 pages of a newspaper?
Thank you in advance for your help and best regards from Poland.