You should see a pay now button when logged into the account panel at https://x10hosting.com/panel/invoices if this is your first payment.
All renewals are handled automatically through your PayPal account as it is a subscription service.
The coupon code X10FREE75 is still active.
Towards the free logo, it is hard to say as their website's front page says $0, limited time only, but then $5 as you attempt to go through the process, someone likely just didn't update the main page
if you haven’t logged into your panel in almost 2 months, that can be a reason for termination among other violations of terms of service https://x10hosting.com/tos
This is not indicative of this. This is a client side error.
https://kinsta.com/knowledgebase/ssl_error_rx_record_too_long/
Security software can also interfere.