If you try to install FarmTek Polaris Timing System connected via USB on Windows 10, you will likely run into an issues where AXtime doesn't register timer trips from the Polaris Timing Console.
THIS IS A DRIVER ISSUE - look in Device Manager under Ports (COM & LPT) for a yellow exclamation point on your Prolific USB-to-Serial Comm Port. Windows tries to install the default Windows Prolific USB-to-Serial Comm Port driver which is newer but not compatible with the USB to Serial adapter FarmTek provides.
To rectify this problem, follow this FarmkTek guide to uninstalling the problem driver and stopping Windows from automatically choosing it's own drivers: http://farmtek.net/win8_driver_fix.html
I downloaded and installed the Windows 7 driver off the FarmTek website here: http://farmtek.net/download/win7_driver.exe
It should work now using the proper driver and AXtime will register timer trips.
If your COM port shows an error again, follow these steps to manually select the proper driver:
Device Manager > right click Prolific USB-to-Serial Comm Port > Update Driver Software... > Browse my computer for driver software > Let me pick from a list of device drivers on my computer > select Prolific USB-to-Serial Comm Port Version: 126.96.36.199 [2008-09-24] (not the 2015 driver!)