Same issue. Deleted the old .json file as well and same error. 

Error while compiling: LootBouncer.cs(217,91): error CS1061: Type `SpawnPointInstance' does not contain a definition for `parentSpawnPointUser' and no extension method `parentSpawnPointUser' of type `SpawnPointInstance' could be found. Are you missing an assembly reference?

Well I went back to the website even though when I downloaded the updated that was posted 20mins ago, I downloaded it again, deleted the .cs and .json file, reloaded the plugin and it works. Didn't get the error message

all updated
getting this after this plugin had its patch

Error in console:
"Error while compiling: LootBouncer.cs(217,91): error CS1061: Type `SpawnPointInstance' does not contain a definition for `parentSpawnPointUser' and no extension method `parentSpawnPointUser' of type `SpawnPointInstance' could be found. Are you missing an assembly reference?"

The only way you would see this error is if your server is not using any of the last 3 official builds of Oxide from today.