No. Even physical copies from 2010 require a one-time Battle.net authentication. The game is designed as a “hybrid” offline/online product. Any site promising a pure offline installer is distributing pirated, outdated versions (usually patch 3.0 or earlier) that lack campaigns like Legacy of the Void.
: Unofficial versions often lack the ability to save progress properly or earn achievements, which are tied to your Battle.net profile Troubleshooting Common Issues "Authorization Required" Error download starcraft 2 offline verified