Problem
After opening Citavi you receive a message that the project is read-only.
Causes and solutions
Enter your license key for Citavi for Windows.
Citavi 6
You are either not logged in to your Citavi account or there is no license key linked to your account.
Citavi 5 or earlier
You have not entered a license key in Citavi and have entered more than 100 references per project. Citavi Free has the complete functionality of Citavi for Windows, with one limitation: you cannot save if you have more than 100 references in all open projects. Please enter your license key.
In Windows Explorer, right-click the Citavi project file and then click Properties. Click General and then clear the Read-only checkbox.
Extract the project by right-clicking the ZIP file and clicking Extract all. Open the extracted project file.