Angle 5 is compatible with all 32-bit or 64-bit versions of Microsoft Windows from Windows XP to the latest ones. There are no other system requirements. Faster processors are recommended, thus reducing calculation times.
No. simply re-run the installation file and Angle will update your existing copy.
No. all your data will be preserved.
This is most probably due to security restrictions on your computer/network. You might not have the right to install software on your computer. Please contact your system administrator for help.
No, that would not be the best way to use Angle since you will not be able to register it properly this way. The proper way is to install and register Angle on each computer separately (the number of installations depend on the number of Angle licenses you have). You can use the import and export function to easily share your parameters (e.g. for your detectors) from one computer to another.