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With any versions of ProGet – from free to Enterprise – you’ll be able to access the repositories but scaling down from Enterprise to basic, or basic to free , you'll lose access to license filtering, feed-level user privileges, and other benefits that many users have come to enjoy, depend on, and take advantage of throughout their use of enterprise or basic ProGet. Very rare are there cases folks want to lose those features but if it's necessary, your team will still be able to access the repositories.
Take a look at the full break-down of features and benefits per version here: http://inedo.com/proget/pricing/features-by-edition