I bought the 1 euro trial key and I saw that it said 3 days for 1 session does this mean I can use the bot 1 until I close heartstone or is the key valid for 3 days ?
it means you can use the bot anytime in the 3 days, but the bot can only hookup to one hearthstone session at a time.
The bot will be valid for 72 hours after first use. Even if you keep HS open, the bot will kick you out once the 72h have passed. (This is to avoid people keeping the program open to leech days)