Call Autodesk activation hotline (phone number shown in error). Explain you reinstalled on same PC; they will reset activation count.
: Choose "Browser Download" for a more stable experience. This often involves two parts (e.g., Part 1 is ~2GB). Installation : Run the downloaded autocad 2018 download and install permanently link
Are you attempting to reinstall a version, or Call Autodesk activation hotline (phone number shown in
file as an administrator, extract the files, and follow the on-screen prompts. Permanent vs. Subscription Licensing How to Download and Install 2018 Autodesk Software or file as an administrator