Because Autodesk Revit 2018 is an older version, finding the correct download links requires navigating Autodesk's legacy platforms. Autodesk has officially retired traditional product downloads for versions older than three years, meaning the extensions are no longer listed on the standard Autodesk App Store homepages.
: Sign in to the Autodesk Account Management portal. Download Revit Extensions for Autodesk Revit 2018
Leo logged in. The download was a modest 47 megabytes—tiny, ancient, forgotten. As the installer ran, the office lights flickered. He ignored it. Old building, faulty wiring. Because Autodesk Revit 2018 is an older version,
: Select your country/region, accept the terms and conditions, and click to finalize the setup. Verify in Revit : Launch Revit 2018. A new Extensions Leo logged in
If you need third-party plugins or specific content libraries that are not included in the standard extensions: Autodesk App Store