To ensure your computer's safety and stay compliant with licensing, you should use official Autodesk methods:

: Open the application and select the "Sign in with your Autodesk ID" option.

: Obtain the software directly from Autodesk or an authorized partner.

: Using unauthorized activation methods can lead to legal action for copyright infringement. Legitimate Activation Method

: Official product keys for the 2015 versions (such as 001G1 for AutoCAD 2015) are necessary for a standard installation.

For users who cannot afford full professional licenses, retailers and sites like Autodesk often provide educational licenses for students and educators or trial versions for testing. System requirements for AutoCAD 2015 - Autodesk

: Files hosted on these platforms often contain malware, trojans, or spyware. Keygens are high-risk because they require you to disable antivirus software and run with administrator privileges, giving any embedded malicious code full access to your system.

: Pirated software may lack essential official updates and hotfixes, leading to crashes or data loss.