If prompted, you can choose where to install Illustrator. Ensure you have enough space on the selected disk.
: If it does not appear in Creative Cloud, you can reach out to Adobe Customer Care via live chat to request a temporary link for an offline installer Free Alternatives If you cannot access CC 2020, you can use install adobe illustrator cc 2020 on mac pre top
Are you getting a specific (like Error 501 or 146)? Are you using an Intel Mac or an M1/M2/M3 chip? If prompted, you can choose where to install Illustrator