If your official legacy installer triggers a "Developer cannot be verified" warning due to expired certificates, right-click (or Control-click) the installer file and select to manually bypass the Gatekeeper prompt. Step 3: Run the Setup Routine Once you have obtained the official DMG file from Adobe:
When the installation completes, close the installer window but do not open the app. 5. Activating and Finalizing Launch the Application: Open Adobe Illustrator 2020.
Once you have the .dmg file or the Creative Cloud download ready: install adobe illustrator cc 2020 on mac pre top
Open the app, go to "All Apps," click the three dots next to Illustrator, and select "Other Versions."
If an older installation failed midway, it can block new attempts. Download the official Adobe Creative Cloud Cleaner Tool to wipe broken session instances before trying to reinstall. If your official legacy installer triggers a "Developer
At least 3 GB of available hard-disk space for installation; additional free space required during installation.
Find Illustrator in the list and click the next to the "Open" or "Install" button. Select Other Versions . Activating and Finalizing Launch the Application: Open Adobe
Fix: Illustrator scans system fonts upon startup. If it freezes, open your Mac's Font Book application, select all fonts, and run to locate and delete corrupted font files.
Do not attempt to patch software files with external activation tools, as this breaks code-signing signatures and compromises system security. Instead, confirm activation directly through official framework systems:
Inside the mounted disk image, you'll find an "Install" or "Install.app" file. Do NOT double-click it directly — this often causes errors.