If you are using hosted ConnectWise, you need to set your $connectwise variable in config.php to https://api-na.myconnectwise.net instead of https://na.myconnectwise.net
Change the country code to whichever you have when you visit the site to login.
See the StackOverflow link below, the second answer fixes this. You need to attach the CA cert to cURL since it does not come stock with them on most Windows machines. The cacert.pem file includes the CA for connectwise as well as most other major sites including Slack.
Ensure that CURL is installed and enabled in PHP.
Install CURL: sudo apt-get install php5-curl
Modify your PHP .ini to include extension=curl.so and restart Apache
You can find your .ini file by running php --ini in a terminal
See here: https://www.codeooze.com/coding/php-curl-on-windows/
Or google "enable curl windows" and use your best judgement on what site to choose.
You can reach me on the r/msp Discord, LabTechGeek Slack, or via reddit at /u/jundis if you have a bug or run into any issues, but support will be limited as I turn my focus to developing the hosted solution.
You can also reach me at joey(at)und.is should you need more intense support, custom modifications, or want your install done by me.