Both CSpect and SNasm are free - the "payments" are donations to contribute. There's a take me to the downloads link on the donation page - just the way itch.io works.
So click this text link in the downloads bit:
"No thanks, just take me to the downloads"
Hi Mike, sorry you kinda missed my point. I wanted to make a payment just to say thanks for the hard work. I've got a copy of the software I just like to give back to the devs when I can. plus itch.io tells me when there are new versions. I'll just send you another coffee ;) thanks for the great work!