The acad.msi file is a core component for AutoCAD installations, and "missing" errors typically indicate corruption or an inability to locate source files. Instead of a standalone download, users should locate the file within existing installation media, check default C:\Autodesk\ extraction folders, or redownload the full installer via the Autodesk Account portal . Install error - unable to find acad.msi - Forums, Autodesk

Instead of searching for a standalone "acad.msi download" on third-party sites (which can be dangerous), you should: Log in to your . Navigate to All Products and Services .