Do you mean on Devine's personal website?
https://wiki.xxiivv.com/site/donsol.html

That's the old Electron build, which we phased out.
You can still find the old version there, but we don't make builds for it anymore.
https://github.com/neauoire/donsol-js

We might at some point make a web version again. The official Donsol website is at:

https://100r.co/site/donsol.html

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If you've bought Donsol and want a refund, let us know, we'll take care of that :)