Newspaper 7 and php 7 compatibility

Hi

I did a PHP 7 compatibility scan with newspaper theme 7.8, I got 3 errors and 4 warnings :

What should i do ??? stick at PHP 5.6 or yet update to PHP 7?

-FILE: /home/public_html/wp-content/themes/Newspaper/includes/wp_booster/td_translate.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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291 | WARNING | Function name “__td” is discouraged; PHP has reserved all method names with a double underscore prefix for future use
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FILE: /home/public_html/wp-content/themes/Newspaper/includes/wp_booster/external/less.php-master/lib/Less/SourceMap/Base64VLQ.php
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FOUND 3 ERRORS AFFECTING 1 LINE
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156 | ERROR | Bitwise shifts by negative number will throw an ArithmeticError in PHP 7.0
156 | ERROR | Bitwise shifts by negative number will throw an ArithmeticError in PHP 7.0
156 | ERROR | Bitwise shifts by negative number will throw an ArithmeticError in PHP 7.0
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FILE: /home/public_html/wp-content/themes/Newspaper/includes/wp_booster/external/less.php-master/lib/Less/Parser.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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470 | WARNING | INI directive ‘mbstring.internal_encoding’ is deprecated since PHP 5.6.
471 | WARNING | INI directive ‘mbstring.internal_encoding’ is deprecated since PHP 5.6.
478 | WARNING | INI directive ‘mbstring.internal_encoding’ is deprecated since PHP 5.6.

– I got 16 PHP 7 compatibility warnings with WPBakery Visual Composer!!!!!!

Please help:

Thanks