Which Version of the Windows you are using? Check to see if any file is blocked by firewall or deleted by anti virus. Try to reinstall the software after restarting your PC. This Should not happen I have installed the software on Windows 7,8 and 10. But if you still face the problem then write your issue at https://collabcad.gov.in/eCollabCAD/contactus or send email to firstname.lastname@example.org.
Please share your experience about the modeling, drawing, assembly and etc. etc. Can we compare collabcad with autocad?
No You can't compare collabcad with any other software. If you do then you'll get disappointed. It has it's own ways of working. You need an open mind to work on it. The Software is still in it's early days of development so don't keep high expectation.But once you get the hang of the software you will enjoy creating models on it. I made some tutorials on CollabCAD and posted it on Youtube. You can watch the tutorials on my channel https://www.youtube.com/channel/UCweq62mK_L4_HEoO8DvT7Gg