I see posts about LINQ for the server database and a post in '16 using AsQueryable in 1.4, but I can’t seem to find any information about this method. Was LINQ removed from Lite? I’m on 2.6.
Yes, LINQ was removed in 2.0 (it never really fully made its way into 1.x, it was sort of an experiment). I find this unfortunate, but because of the new query model it is difficult to provide LINQ support (in fact it would give little benefit without the ability to pull strongly typed items out of the database). However, the new QueryBuilder looks a lot like LINQ in my opinion (if you have ever approached LINQ from the implementation side).