I'd also like to know. 6.5.22 is so old it won't run with the latest php and mysql versions on my new server. It just blows up with a pageful of errors. Works fine on a dangerously antiquated LAMP stack, though.
you can use a Linux distribution that still updates its PHP 5.3 packages, like RHEL/CentOS 6 or Ubuntu 12.04.
But since Sugar 6 CE is nearly discontinued from Sugar (other than small bugfixes), do not expect support for newer PHP versions anytime soon.
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