if i buy always alive addon to my bot and now my that bot is no longer in use so i delete that bot , so can i transfer that always alive feature to other bot or i have to buy another always alive addon

You can transfer. Disable and enable on the new one. https://cdn.discordapp.com/attachments/1246889591567548477/1247105469013688421/image.png?ex=665ed0f9&is=665d7f79&hm=00d29b7e77cdb67641d05ccc0b171d0abcdf49b68af3a1176140fa0b4513cd1a&

As zubiwat🦸‍♂️ said, yes. You buy it on a workspace level, so you can change it between the bots in that specific workspace.