I just published version 1.5 to PyPI.
Some work to support newer Sphinx versions. Under the hood, biggest change is now build is invoked in a subprocess. Latest Sphinx versions use sys.argv and sys.exit internally which makes it difficult to use in the same process as Tinkerer.
Tons of other bug fixes and improvements.
Many thanks to everyone for your involvement and for using Tinkerer!
Thank you,
Vlad