If you are set on using APVacars, you can try using phpVMS 5.5.2 or 5.5.2.72
Be aware that you will need either PHP 5.6 or 7.0-7.2 respectively - and there is no guarantee that all functions will work correctly.
But I wouldn't invest any money on phpVMS 5.5.2 or 5.5.2.72 - I'd install phpVMS v7 and invest my money there.