i am looking for the resent update for after effects April 2014 .
is it avilable for download ?
There is no such thing. The next version of CC will be due end of May/ early June. You simply mistake an early demo for a release.
As Mylenium says, there is no "April update" for After Effects. We demonstrated and released details of the next version in conjunction with a tradeshow in April. The software will be released soon.