You can download the latest version of SimplePie from SimplePie.org and install it by following the instructions. You can find example uses with SimplePie Ideas.
Take the time to read Requirements and Getting Started to make sure you’re prepared to use SimplePie. No seriously, read them.
**NOTE** Passing this test does not guarantee that SimplePie will run on your webhost — it only ensures that the basic requirements have been addressed.
¹ — SimplePie 1.1 will be the last version to support PHP 4.x. All versions released after January 1, 2008 will be PHP 5-only because the core PHP team is giving PHP 4.x an end-of-life status and discontinuing patches and support. Read the announcement.
² — Some recent versions of the PCRE (PERL-Compatible Regular Expression) engine compiled into PHP have been buggy, and are the source of PHP segmentation faults (e.g. crashes) which cause random things like blank, white screens. Check the Support Forums for the latest information on patches and ongoing fixes.