Download links for 2.1 don't all work
The link to the 64-bit 2.1 zipped installer goes nowhere.
“Zipped installer: install_sw4stm32_win_64bits-v2.1.zip”
http://www.ac6-tools.com/downloads/SW4STM32/install_sw4stm32_win_64bits-v2.1.zip
And the link to the “latest” takes you to a file dated: 2017-05-18
Similar things happened the last time you released a new version.
Bill