Norton is blocking a legitimate site

Hi,  my Norton product has been blocking a legitimate site for several months now.  As I am a member of the organisation of the site in question, I have used 'continue to site anyway', but more recently when I do this it blocks the site again.  I don't have the same issue on my mobile and tablet devices.  I need to use my PC for this to download vocal tracks for burning to CDs.

Advice welcome!  Thanks.

Liz