vBulletin 4.2.5 is end of life and will not be receiving any future development. Warning: vBulletin 4.2.5 is not compatible with PHP 7.2.0 or higher.
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No. you will need at least 4.2.3 for php 5.6.
4.2.1 is obsolete and the highest version of php you can use with that is 5.3. php 5.3 should not b run on a production server as it is end of life and unsupported.
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