Not Compatible with PHP 7.1

Hello – Siteground, my webhost, will not allow me to upgrade to PHP 7.1 due to plugin conflicts. They are saying that GigPress is not compatible and return the following reason:

FILE: /wp-content/plugins/gigpress/lib/upgrade.php
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FOUND 10 ERRORS AFFECTING 9 LINES
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694 | ERROR | preg_replace() – /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
851 | ERROR | preg_replace() – /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
2212 | ERROR | Function php_logo_guid() is removed since PHP 5.5
2213 | ERROR | Function zend_logo_guid() is removed since PHP 5.5
2740 | ERROR | preg_replace() – /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
2966 | ERROR | Function name, class name, namespace name or constant name can not be reserved keyword ‘__function__’ (since PHP version all)
2966 | ERROR | Function name, class name, namespace name or constant name can not be reserved keyword ‘__function__’ (since PHP version all)
3357 | ERROR | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found ‘$HTTP_GET_VARS’
3358 | ERROR | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found ‘$HTTP_POST_VARS’
3359 | ERROR | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found ‘$HTTP_COOKIE_VARS’
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Is it possible to upgrade this? Thanks