As you probably know, all my plugins and themes started to require PHP 5.2 in order to run.  PHP 5.2 was released on November, 02 2006 and now it is more than three year mature. I think that all serious providers had time enough to update their servers to this versions as from that date only PHP 5.2 or newer has been available from developers.

Really I would not rely on any operator that got stuck to old and obsolete PHP versions. Those versions are unmaintained, insecure and puts your site on an unnecessary risk. I would suggest you to ask your provider to switch to PHP 5.2 or newer, and if them don’t do it, then switch to a more serious provider. But please, don’t ask me to revert my software to those old PHP versions.

Always you will find the updated system requirements at the System Requirements page.