Problem opening of Demo Database.

Sir,

I have been working on my Demo database since I've installed NAV in my PC. But recently I couldn't use it. Whenever I try to open the demo database it shows the following message:

'The Demo Database database on the XXX server cannot be opened by this version of the Microsoft Dynamics NAV Development Environment. The database has already been converted by a newer version.

You must upgrade the Microsoft Dynamics NAV Development Environment to the latest version to open the database.'

Now I've installed a new database on my PC & through which I can work now. But I have some important coding stored in my previous 'Demo Database'. Now, I can't open the database at all. So, can anyone guide me to open my previous 'Demo Database'. It's very important.

Thank You,