Re: Trying to install PDF.js
I have Tiki 19.1 installed, and a PDF files saved in a file gallery opens already automatically in a new browser tab. So there is no need to install anything.
Otherwise you could try to change TikiRoot\tiki-download_file.php
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if (! $content_changed and ! isset($_GET['display'])) {
Replace by:
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if (! $content_changed and ! isset($_GET['display']) and $info['filetype'] != 'application/pdf' ) {
Btw, go the tab 'Packages' in Control panels to install extra packages ( I don't think the way you subscribe is the way to install extra functionality)