These apps use verb/command syntax and the parameters for each verb/command vary.. Whenever I'm starting up our ERP system on a pc, it keeps saying that .NET Framework 3.5 isn't installed. The problem is in Windows for sure, it happend after a Windows 10 update. Download and install the feature won't help, I had this problem before on a Windows. The offline package can be used in situations where the web installer cannot be used because of a lack of Internet connectivity. On Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, or Windows Server 2008 R2 SP1, Microsoft.NET Framework 4.6 is installed under Programs and Features in Control Panel. On Windows 8 or Windows Server 2012. To use File Explorer to check the .NET Framework version on Windows 10 , use these steps: Open File Explorer. Browse the following path: C:\Windows\Microsoft.NET\Framework. ... Could not execute because the specified command or file was not found. Possible reasons for this include: * You misspelled a built-in dotnet command.