You can get support at https://www.assettocorsa.net/forum.
Please use the proper forum sections and in case of bug submission, zip and attach the whole “Logs” folder located in your “C:\users*youruser*\AppData\Local\AC2\Saved” folder (the “AppData” folder is hidden by default, check “Hidden items” in your Windows view properties). In case of a crash report, please always zip and attach the whole “Crashes” folder located in the same directory.