- How do I upgrade these files to current version supporting VS 2005?
When using the Template Studio, all former bound templates, which are former official templates, are marked red. That means, as far as I understood, templates are missing.
Do I have to download former official templates and bind them to a new LLBL-Project, which supports VS 2005
I would do a compare against original template and your new one to find the differences and then start with the new 2005 template and try to make your modifications to the appropriate places in those templates. If you run into any issues in particular then I wouldn't hesitate to ask. As far as the red files I would just ensure that the paths look valid in the config.
2.I is possible to use a LLBL-Project, compiled for VS 2003, which a VS 2005-Project only uses a 'DataLayer' And how would I then use it
You could just add the reference in the 2005 project to the 2003 compiled dll. You would then be able to use it and if you have the debug file then you can debug the code also. If you try to add the actual project to the solution it will try to upgrade your project.