What is the differences between the LITE and PREMIUM versions?

Lite is just 1 difficulty level

Premium is 5 difficulty levels

Premium also has player lockouts and buyraid

Premium is exactly the same as the old version from last week, it just costs $50 now.  
The lite version is a limited demo version basically of what it used to be.

It's not exactly the same, there are many fixes include in 2.0.0 to 2.0.1

Rewrote method to despawn bases after they are raided
Fixed item mods not losing condition when `Block Plugins Which Prevent Item Durability Loss` is enabled
Fixed the spawn height issue introduced in 1.7.1
Fixed custom map building prefabs blocking spawn locations
Fixed box skins using deployed skin settings
Fixed npc skins not showing immediately
Fixed `Ignore Containers That Spawn With Loot Already` not applying to lockers
Fixed RemoveMountable.NullReferenceException?
Fixed `Always Spawn Base Loot Table` not working when allow duplicates is false
Fixed paste height not always using the proper paste options
Fixed payment not being taken when Lock Raid To Buyer And Friends is false
Fixed issues with `Auto Turrets Power On/Off Automatically`
    - Fixed issue where turrets state could become stuck in offline mode
    - Turrets now come online after a turret is shot while being offline
    - Turrets will no longer go offline if they've been attacked within 60 seconds

Added `Ignore If Skinned Already` (true)
Added `Add Code Lock To Tool Cupboards` (false)
Added `Add Code Lock To Boxes` (false)
Added `Auto Turrets > Random Weapons To Equip When Unequipped` (rifle.ak)
Added `Additional Containers To Include As Boxes` (none) - example: vendingmachine
Added command `rb ignore_restart` to temporarily ignore server restart check
Added command `rbe active`
Added `Block Controlled Mounts` (false)
Added OnPlayerEntryRejected message
Updated method for grid location
Changed the minimum value of Protection Radius from 0 to 12.5 meters
Changed `Entities Not Allowed To Be Picked Up` to allow partial names
Changed `Despawn Spawned Mounts` to not apply to unclaimed mounts
Removed `Flame Turrets Ignore NPCs` as this is now a core feature
Blocked npcs from triggering guntraps, flameturrets and HBHF sensors by using OnEntityEnter hook and removing CanBeTargeted hook
Ignore players mounted to a train​