By default I only deal with cryptocurrencies, my automated checkout page supports BTC and LTC but you're free to contact me if you'd like to pay with other coins.
As long as this thread stays open it means that you can safely buy the miner. Should I have have issues with it, I'd just stop sales by locking the thread.
As per my other miner, builds backups are going to be deleted from my server by the end of this week to limit disk space consumption. Remember you can always download them or re-create them in seconds.
Mining requires powerful computers, I do not recommend to run the miner on your netbook or your old home computer as it might not bring you any income at all.
Along with the miner you'll get access to some simple spreading methods that will help you to understand how to distribute applications (in case you're unaware about them)
Running the miner on a computer that you don't own without explicit owner approval is illegal. I have no control over your way to use my software so be aware that you're the only one liable for that.