Slate Desktop™ is developed and tested with Python version 3.8.x. Versions 3.8.0 and newer are.
The Python Foundation has published this announcement:
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won’t be maintained after that date. A future version of pip will drop support for Python 2.7.
Versions of before Slate Desktop™ update 1.7.0 installed Python 3.7. We found a serious incompatibility between this version and one of the additional libraries that we need. Therefore, all future development with Slate Desktop™ will be Python 3.8 and above and we ask all customers to update to Python 3.8. Installers after 1.7.0 takes care of this in most cases.
The Slate Desktop™ installs Python with its installation if it was not found on the PC, but it does not uninstall Python.
We strongly urge customers to follow the instructions in this article to uninstall Python 2.7, Uninstall and Deactivate (https://www.slate.rocks/portfolio/uninstall-and-deactivate/). Then, when Slate Desktop™ re-installs, it will not detect Python and install the newest version.