How do I fix an “Invalid license data. Reinstall is required.” error in Visual C# 2010 Express?

Question

I\'ve tried to install Visual C# 2010 Express edition onto my PC, but whenever I try to run it, I get a error message.

Invalid license data. Reinstall

Answer 1

I get this error only when trying to open older solution files. For instance, I've got VS2013 installed and this error message pops up when I double click on a VS2010 solution file.

Getting rid of it is so simple:

• Launch VS2013

• Open the old solution file by clicking
  "File->Open->Project/Solution..." from the menu (or simply by
  pressing Shift+Ctrl+O)

• Save the solution with the new format by clicking "File->Save Solution As..." and overwrite the old file.