I am having trouble installing dashboard on my computer that runs windows XP. On this forum someone had a similar issue that was resolved by upgrading to .NET 4.5. Do I need to update my operating system to install dashboard? Microsoft does not support .NET 4.5 on windows XP.
No, Operations Dashboard for ArcGIS application is not supported on Windows XP OS and as you found, this is because Microsoft .NET 4.5 Framework isn't supported on Windows XP machines. Review Supported operating systems for additional information on operating systems that are supported with Operations Dashboard for ArcGIS application.