Simple Injector v5.0.3 is available through Nuget.
When upgrading from v4.x, please make sure you upgrade your application to the latest v4.x version of Simple Injector first. After that upgrade directly to the latest v5.2.x release.
This patch release improves reporting of duplicate registrations during Auto-Registration in case the same assembly is (accidentally) loaded twice (while the runtime considers them separate assemblies). Simple Injector will now report (through an exception message) that the assembly is loaded more than once and it describes how to solve this problem.