Install PHP tidy extension into XAMPP in Windows

Question

I want to add PHP Tidy to my XAMPP installation on Windows. However, I don't really know where to start and am not familiar with the command line. I found the php.ini file and uncommented the lines where it spoke about Tidy. However, this produced:

Warning: PARSERHTML::_load_html(): Unable to load Tidy configuration file at 
'/usr/local/lib/php/default.tcfg'. in 
C:\Users\User\Dropbox\Entwicklung\root\phitCMS\features\phpdocx\classes\DOMPDF_lib.php on line 
2660

Warning: tidy_parse_string(): Unable to load Tidy configuration file at 
'/usr/local/lib/php/default.tcfg'. in 
C:\Users\User\Dropbox\Entwicklung\root\phitCMS\features\phpdocx\classes\DOMPDF_lib.php on 
line 2688

Further, I read on Stackoverflow but only found solutions regarding Mac OSX and something called "Homebrew".

Also I wonder: What will happen if I install Tidy locally and upload my website online? Then Tidy will eventually not be there and my website does not work properly?