After you buy, you get a link. Sign in to your free Google account, click Make a copy, and the tool is saved in your own Google Drive.
No. One payment. Use it as long as you like.
Yes, in the free Google Sheets app. Setup is easiest on a computer.
Yes. Every tool includes a tested Excel version (.xlsx) for Excel 365, Excel 2021 or newer, and free Excel for the web. The download link is on your delivery page.
Email wischavenindustries@gmail.com with your order number.