FYI - Cura 2.6.63 doesn’t work and 21.08 does. Read below.
I uninstalled a working version Cura 21.08 to get the latest Cura software 2.6.63 for a LulzBot Mini running software on a Dell Precision Windows 7 laptop. Windows 7 recognized the Mini and gave it USB comm port 13 (In Device Manager --> 3D Printer powered by RAMBo) plus the little beeps as you plugged and unplugged the USB cable. Cura 2.6.63 was unable to connect to the Mini even after a reboot. I gave it plenty of time to search for the comm port as i grabbed a sandwich waiting on it. I then uninstalled and reinstalled the software and it still was unable to recognize the Mini. I then uninstalled deleted the folder out off AppData/Roaming/Cura?? and installed the next older version Cura 2.6.52 and had the same issue. I then uninstalled everything and went back to 21.08 and everything works correctly.