Compatibility issue with PHP 7.3

Hello,
I am using the latest free version (2.12) of Seraphinite Post .DOCX Source, and it works perfectly well. Still, a compatibility check with my currently installed PHP version (7.3) results in the warning and errors listed below. Could you please investigate and share your views on this?
Thanks.
FILE: /home/xxxxxxxx/public_html/wp-content/plugins/seraphinite-post-docx-source/Cmn/Gen.php
——————————————————————————————————————————————————-
FOUND 8 ERRORS AFFECTING 2 LINES
——————————————————————————————————————————————————-
300 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
300 | ERROR | Function mcrypt_encrypt() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
300 | ERROR | The constant “MCRYPT_RIJNDAEL_256” is deprecated since PHP 7.1 and removed since PHP 7.2
300 | ERROR | The constant “MCRYPT_MODE_ECB” is deprecated since PHP 7.1 and removed since PHP 7.2
365 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
365 | ERROR | Function mcrypt_decrypt() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
365 | ERROR | The constant “MCRYPT_RIJNDAEL_256” is deprecated since PHP 7.1 and removed since PHP 7.2
365 | ERROR | The constant “MCRYPT_MODE_ECB” is deprecated since PHP 7.1 and removed since PHP 7.2
——————————————————————————————————————————————————-

FILE: /home/jvvrbhvj/public_html/wp-content/plugins/seraphinite-post-docx-source/Cmn/Plugin.php
————————————————————————————————————————————————————–
FOUND 7 ERRORS AND 1 WARNING AFFECTING 8 LINES
————————————————————————————————————————————————————–
1258 | WARNING | Method name “Plugin::__RateIt_ShouldShow” is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
1677 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80004001’
1678 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80004005’
1679 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80004021’
1680 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80070005’
1681 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80070057’
1682 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80070490’
1683 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x80070570’
————————————————————————————————————————————————————–