I attempted to install shhlack to my windows 10 machine, but found that because Slack had left a previous version installed in the same appdata folder it attempted to install it to the older version. Once I deleted the older version it did install properly into the newer version, but the newer version of slack (I am on the desktop app slack version 3.3.8) doesn't appear to work (unless I am missing something somewhere). The Chrome extension appears to still work, but the Firefox extension doesn't exist anymore as far as I could tell.