Contact
If the download breaks, write. I fix it. You don't get added to anything.
The link dies after 48 hours. That catches people who buy on a phone in a cafe and open the email three days later on a laptop. No form, no ticket number, no account to recover. Write, and a new link comes back.
The mailbox is also for telling me I got something wrong. Quote the part. Vague is useless to both of us.
It is not for guest posts, link swaps, your course, or the word collaboration doing work no other word will do.
I read everything. I answer most of it, eventually. Sometimes from a bus.