So, you've already successfully installed and activated SubLab. But, when you want to use SubLab it still asks you to activate when you open it up.
We've seen this a couple of times on support recently. We think this is related to the permissions setting on the folder "Library/Application Support/FAW/SubLab".
When you activate SubLab a key file is generated. But if your permissions settings are not correct the key file can't be saved on your hard-drive.
To fix this, you'll need to set the permissions correctly on the SubLab folder.
To do this follow the clip below, making sure that all the permissions are set to "Read & Write".