We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#2175 - Auto extraction installation of Composr beta 1 errors on step 5 with undefined function "get_option()"
Issue was when installing with an https:// base URL. This activated the cURL downloader code branch (more robust on https) which tried to access the config system for the proxy settings, but that was not yet initialised at that point in the installer.
function get_option()
{
debug_print_backtrace();
exit();
}
at the bottom of install.php, and tell me what that says when it was previously doing the reported issue, that should help.
Or if I can test directly on your server.