Thank you for your reply. As far as I see on website https://bertt.itch.io/arcbrutile-pro-for-argis-pro-30 there is o Download & install instructions, but the message:
"In order to download this tool you must purchase it at or above the minimum price of 25.00€ EUR. You will get access to the following files: arcbrutile-pro.esriAddinX 6.1 MB"
May be I have not recognized the link to instructions? Possibly the instructions are not available until purchase? Any advice appreciated. Thank you.