Sketch or XD alternative or way to install on mac os 10.10.5 Yosemite apart from figma [on hold]

I'm on macos 10.10.5 and need to install a software for UI design and unable to install sketech or XD. Can someone please sugget me an alternate. Thanks in advance. P.S. I searched over google for like 5 hours but failed miserably and figma is too slow