PHP 7 Compatibility check shows errors

I am using the PHP Compatibility Checker plugin on my site before upgrading to PHP 7 on WP Engine hosting. This plugin is showing multiple errors. Here is what the plugin says:

FILE: /nas/content/live/…/wp-content/plugins/wp-ultra-simple-paypal-shopping-cart/up-function.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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32 | WARNING | Function name “__UP_strtolower_utf8” is discouraged; PHP has reserved all method names with a double underscore prefix for future use
55 | WARNING | Function name “__UP_detect_language” is discouraged; PHP has reserved all method names with a double underscore prefix for future use
73 | WARNING | Function name “__UP_wp_load_scripts” is discouraged; PHP has reserved all method names with a double underscore prefix for future use
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FILE: /nas/content/live/…/wp-content/plugins/wp-ultra-simple-paypal-shopping-cart/paypal.php
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FOUND 2 ERRORS AND 1 WARNING AFFECTING 2 LINES
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14 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
195 | ERROR | Function eregi() is deprecated since PHP 5.3 and removed since PHP 7.0; use preg_match instead
195 | ERROR | Extension ‘ereg’ is deprecated since PHP 5.3 and removed since PHP 7.0 – use pcre instead.
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Do you plan on making the plugin compatible with PHP 7?

Thank you