Can I activate SubLab offline? Julia@FAW August 16, 2019 07:04 Follow SubLab requires an internet connection to activate. You only need to connect to the internet long enough to paste in your activation code and hit the activate button. After activating you can use SubLab completely offline! . . . Related articles How many computers can I use SubLab on? Is there a Downloads limit for SubLab? How do I activate Circle offline? I received the error message "Can't connect." I received the error message "Serial in use." Comments 0 comments Please sign in to leave a comment.