Insert Pages parse error when activating plugin

What version of Insert Pages are you running? And what PHP version? I have no problems with PHP 5.6.30 (5.6.30-1+deb.sury.org~trusty+1) and Insert Pages 3.2.8.

Unfortunately there’s not a great way for us to support PHP < 5.3. The last update included integration support with Elementor, which uses namespaces, which aren’t compatible with PHP 5.2.

Also, as a PSA, 5.2 is almost 10 years old, and reached end of support in 2010:
https://www.dotkernel.com/php-development/end-of-support-for-php-5-2-x-branch/

It has over 100 unpatched vulnerabilities:
https://www.cvedetails.com/vulnerability-list/vendor_id-74/product_id-128/version_id-57302/PHP-PHP-5.2.6.html

So you may want to evaluate what your “specific reasons” are, since it’s rather dangerous to run in a public environment.

All that said, if you really want to keep using the plugin without upgrading PHP, you can revert to version 3.2.7 of the plugin:
https://downloads.wp.xz.cn/plugin/insert-pages.3.2.7.zip

The plugin works fine on PHP 5.4 (I tested against 5.4.45).

Either:

1. Your web server is running a different version of php than you think, or
2. The plugin source has been modified.

You can output <?php phpinfo(); ?> in any page on our web server to get the version of php that is running. You can also compare the line reporting the error with the official source:
https://github.com/uhm-coe/insert-pages/blob/master/insert-pages.php