do we have a darkpoold client for download? or have to compile from source code?
what will happen i have a several address in my wallet?
after burn,,what should i to do to claim my BLUR?
signature with my private key?
Yes. It is Python, so its not "compiled". You need the python dependencies listed in the readme, which you can install using the command described there using pip to pull them all in for you.
If you have several addresses in your wallet, you can send from them individually if you want.
After burning, you don't have to do anything to claim the BLUR. They are automatically associated to your wallet address/key. You can use the wallet command with darkpoold (darkpoold wallet) to see all of the addresses in your wallet and what assets are associated to them.