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It sounds like you are looking for information on using a cracked version of Revit 2021, specifically regarding the "internet connection required" error or requirement often found in these files.

: For perpetual licenses, connecting to the internet only once for registration allows you to use Revit 2021 offline indefinitely afterward. Official Alternatives

: Proxy settings, VPNs, or firewalls often trigger this error message even on legitimate installs if they block the specific URLs needed for license validation. Risks of Using Revit 2021 Cracks