Getting error when enabling latest version 2.6.5

Hi there,

We are using your paid plugin for revision and recently we updated to latest version 2.6.5 and we are getting following errors. Since it was giving error we reverted back to old version “2.5.99” which is working for us. So can you please check and let us know what is missing or how to fix this issue.

++ /bin/wp plugin is-active adminimize
 PHP Fatal error:  Uncaught Error: Class 'shellpress\v1_3_82\ShellPress' not found in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php:22
 Stack trace:
 #0 phar://bin/wp/vendor/composer/ClassLoader.php(444): include()
 #1 phar://bin/wp/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/var/www/drupal...')
 #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('tmc\\revisionman...')
 #3 /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/revision-manager-tmc.php(35): spl_autoload_call('tmc\\revisionman...')
 #4 /var/www/drupal/courses/dist/wp-settings.php(308): include_once('/var/www/drupal...')
 #5 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1209): require('/var/www/drupal...')
 #6 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.ph in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php on line 22
 Fatal error: Uncaught Error: Class 'shellpress\v1_3_82\ShellPress' not found in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php:22
 Stack trace:
 #0 phar://bin/wp/vendor/composer/ClassLoader.php(444): include()
 #1 phar://bin/wp/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/var/www/drupal...')
 #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('tmc\\revisionman...')
 #3 /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/revision-manager-tmc.php(35): spl_autoload_call('tmc\\revisionman...')
 #4 /var/www/drupal/courses/dist/wp-settings.php(308): include_once('/var/www/drupal...')
 #5 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1209): require('/var/www/drupal...')
 #6 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.ph in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php on line 22
 Error: There has been a critical error on your website.Learn more about debugging in WordPress. There has been a critical error on your website.
 + /bin/wp plugin activate adminimize
 PHP Fatal error:  Uncaught Error: Class 'shellpress\v1_3_82\ShellPress' not found in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php:22
 Stack trace:
 #0 phar://bin/wp/vendor/composer/ClassLoader.php(444): include()
 #1 phar://bin/wp/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/var/www/drupal...')
 #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('tmc\\revisionman...')
 #3 /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/revision-manager-tmc.php(35): spl_autoload_call('tmc\\revisionman...')
 #4 /var/www/drupal/courses/dist/wp-settings.php(308): include_once('/var/www/drupal...')
 #5 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1209): require('/var/www/drupal...')
 #6 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.ph in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php on line 22
 Fatal error: Uncaught Error: Class 'shellpress\v1_3_82\ShellPress' not found in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php:22
 Stack trace:
 #0 phar://bin/wp/vendor/composer/ClassLoader.php(444): include()
 #1 phar://bin/wp/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/var/www/drupal...')
 #2 [internal function]: Composer\Autoload\ClassLoader->loadClass('tmc\\revisionman...')
 #3 /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/revision-manager-tmc.php(35): spl_autoload_call('tmc\\revisionman...')
 #4 /var/www/drupal/courses/dist/wp-settings.php(308): include_once('/var/www/drupal...')
 #5 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1209): require('/var/www/drupal...')
 #6 phar://bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.ph in /var/www/drupal/courses/dist/wp-content/plugins/revision-manager-tmc/src/App.php on line 22

Thanks & regards,
Sandeep