how to use plyr on local server

[AppBuilder1984]

Hello Plyr Community,

I am currently walking in the dark. Therefore I thought I create a github account and ask.

I have tried VideoJS before, and now switched to Plyr.

I am developing a stand alone PHP module in order to show videos (local, youtube, vimeo).
PHP code (index.php) is being included using a regular core Joomla4 Module.

I am fetching plyr from below resources and everything looks good.
No errors with Console (Firefox) and player looks good as well:

index.php:

<script src="https://cdn.plyr.io/3.7.3/plyr.js"></script>
<link rel="stylesheet" href="https://cdn.plyr.io/3.7.3/plyr.css" />

I could just download those files and use them locally, correct?
Initially I have downloaded the GitHub .zip and tried to locally include the needed files. But...there is no plyr.css, only a SASS file.

<script src="/assets/apps/Apps/extension/plyr-3-7-3/src/js/plyr.js"></script>
<link rel="stylesheet" href="/assets/apps/Apps/extension/plyr-3-7-3/src/sass/plyr.scss" />

My attempt ended with no player and errors in Console:

• Die Ressource von "/assets/apps/Apps/extension/plyr-3-7-3/src/sass/plyr.scss" wurde wegen eines MIME-Typ-Konfliktes ("") blockiert
• Uncaught SyntaxError: import declarations may only appear at top level of a module
• Uncaught ReferenceError: Plyr is not defined

Now I am confused on how to get and include all necessary files for plyr. I have checked the docs, but I am still confused on how to use the GitHub .zip. Maybe a copy of the 2 cdn files will do just fine. But I want to check with Plyr community first, before I go on developing.