You want to continue working on an Archicad project, but after trying to open it, window appears titled Archicad Environment. The window reads: Latest Project Settings and factory default template Project are missing or damaged. Archicad needs a valid Template Project to start from.
Solution
In this case we can do a Repair installation to fix the corruption that is preventing you from opening Archicad projects.
1. Find an Archicad installer. If you do not have the executable file you can download Archicad from here (make sure it is the same language version).
2. The installer will recognize that Archicad is already installed in your computer.
3. Click on Next to proceed with a repair installation.
4. Wait for the installation to finish
5. Launch Archicad an try to open a new file.
The error message will not appear anymore.
Further steps
If the repair installation does not fix your issue, you can contact Technical support via our Support Site. Send us your Archicad version and build, as well as screenshots of any additional error messages you might be experiencing.