You didn't say, WHERE you've downloaded them from?…
Exact links to accompany your claims would go a long way towards fixing the issue. If there's an issue.
So we've been using version 2.6.26 for awhile now but we're upgrading our servers to php 5.6 and so are looking at upgrading to version 2.6.28 (for the preg_replace deprecated e) or maybe the ...