Konrad,
Thanks for using the Broadcom Community!
I understand you need access to download the earlier version of Symantec Endpoint Protection / SEP (14.3 RU7) and you are unable to view it with your current access.
To better assist you kindly log into the Support Portal using a different browser and check again.
If you have the same issue, then kindly reach out to Broadcom Customer Care for assistance.
NOTE: https://support.broadcom.com/web/ecx/contact-support
Best,
Russ_V