Download the fixed go-pear and just use it if you need to fix only the "Class 'PEAR' error". If you want to use pear with uniform server download the file and uncompress it in the folder C:\UniServerZ\home\us_pear start Apache and Mysql go to the url http://localhost/us_pear and follow the installation process as usual Possible Error: Fatal error: Class 'PEAR' not found in /uniserverz/us_pear/go-pear.php on line 697 FIX - replace the urls of $bootstrap_files within the go-pear.php: $bootstrap_files = array( 'PEAR5.php' => 'https://raw.githubusercontent.com/pear/pear-core/master/PEAR5.php', 'PEAR.php' => 'https://raw.githubusercontent.com/pear/pear-core/master/PEAR.php', 'Archive/Tar.php' => 'https://raw.githubusercontent.com/pear/Archi...