trying to open proseries 2020 and wont open it gaves me this reason

error "403 forbbiden"

called the customer service and they told me that they cannot help me with any proseries  2020 or older versions, I told them that i have been a proseries customer for the last 15 years  and l purchase  all those years and should have acces at least to the las 5 years and the answer was No