As of Nuget 2.8 there is a feature to downgrade a package.

Nuget 2.8 Release Notes


The following command entered into the Package Manager Console will downgrade the couchbase client to version

Update-Package CouchbaseNetClient -Version


Updating 'CouchbaseNetClient' from version '1.3.3' to '' in project [project name].
 Removing 'CouchbaseNetClient 1.3.3' from [project name].
 Successfully removed 'CouchbaseNetClient 1.3.3' from [project name].

Something to note as per crimbo below:

“this approach doesn’t work for downgrading from one prerelease version to other prerelease version – it only works for downgrading to a release version”