I've seen a few postings showing where the latest download for L can be found, but they all said that installing it requires wiping your phone of all apps & user data. So this is not a very appealing approach.
When I put 4.4.3 on my Nexus 5 by using the "sideload" method this did not wipe the phone; it merely updated 4.4.2 ==> 4.4.3 pretty much the same way the OTA update of 4.4.4 ==> 4.4.5 worked. I wonder of there is something unique about L that forces a phone wipe first.