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Product renewals stopped entirely, and the software entered "End of Life" (EOL) status. November 1, 2018: All technical support from Autodesk ceased. Licensing & Documentation ArtCAM 2018 manual I understand you're looking for
Because ArtCAM 2018 is no longer supported, the official manuals are now hosted as legacy resources. Autodesk ArtCAM 2018 - Getting Started official access ended on February 1
For most other subscription holders, official access ended on February 1, 2021 .