Updating to different version besides latest?

[SphericalRedundancy]

Is there a way to update to a version that's above 6.5.3 but isn't 6.6.5?

 

My server has been running smoothly for months and I avoided updating because I wanted to wait until 6.6.X was cleaned up of any of the bigger bugs but when I updated to 6.6.5 last week my server has crashed everyday since, downgrading to 6.5.3 and it no longer happens. I'd like to update to something other than 6.6.5 so that maybe I can narrow down which update is affecting me.

[JorgeB]

v6.6.3 is available on the download page, if you need other releases you can ask LT by email.