Round Edges Corners Extension will not run with purchased license

I’m having issues trying to install the Round Edges Corners extension. I have raised it with the developer who informed me it was a Sketchup issue - has anyone experienced similar issues with this? I’m wondering if it could be a Sketchup 2019 issue.

Thanks in advance

The arc tool is faster than the plugin.

I was hoping it was closer to the Fillet command in Autocad; pick two adjacent lines and specify a radius…

Have a look at Tig’s 2D Tools