Migration guidance and migration resources.

Legacy (for users still on v1)

New vs Old Package and Namespace

CliInvoke changed its NuGet package ID and namespace starting from the re-release of 2.0.0 (tagged as 2.0.0-v2) and has since been published directly under the CliInvoke package ID prefix and namespace.

The previous package IDs are marked as deprecated and will not receive future updates.