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If express-graphql cannot be installed, there are a few things that can be done:

1. Check that Node.js is installed and updated to the latest version.

2. Update npm to the latest version by running npm install npm@latest -g.

3. Try installing express-graphql globally by running npm install -g express-graphql.

4. Check if there are any conflicting packages installed in the project, and try to remove them to avoid conflicts.

5. Try deleting the node_modules folder and reinstalling all packages by running npm install.

6. If none of the above steps work, try using an alternative package for GraphQL implementation such as apollo-server-express or graphql-yoga.

7. Verify that the package name is spelled correctly, and the version requested is valid.

8. Try to install from the repository by cloning it and checking out the version that suits your needs.

These steps should help you to resolve the issue with not being able to install express-graphql.