Possibly not PHP7 compatiable

Dear WP Clone team,

I am using WP clone 2.4.2 on WP 4.7.2 and am looking to change to PHP7. Before making the change, I used the plugin “PHP Compatibility Checker” to check my plugins and themes before making the change. For WP Clone it gave 1 warning and 8 errors.
Here is the printout:

FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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254 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4.
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FILE: /var/www/vhosts/web138.freeweb.webhoster.ag/httpdocs/tinchen.de/Festival/wp-content/plugins/wp-clone-by-wp-academy/lib/class.wpc-wpdb.php
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FOUND 8 ERRORS AFFECTING 8 LINES
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50 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
62 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
74 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
86 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
98 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
116 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
128 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
141 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
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Will this be an issue??

Regards,
John