Could not load file or assembly ‘Office, Version=15.0.0.0’
I also got this error message even if I have Office 2010 and I don’t have Microsoft.Office.Interop.Excel folder under GAC. I found the solution for my case here: https://www.add-in-express.com/forum/read.php?FID=5&TID=15525 You have to reference two dll-files from these folders: C:\Windows\assembly\GAC_MSIL\Microsoft.Vbe.Interop\15.0.0.0__71e9bce111e9429c\Microsoft.Office.Interop.Excel.dll and C:\Windows\assembly\GAC_MSIL\office\15.0.0.0__71e9bce111e9429c\OFFICE.DLL