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8585* No browser tab appeared on macOS or Linux: on macOS, choose Open from the menu bar icon. On Linux, copy the printed URL into a browser on the same machine, or run `claude-science url` to print a fresh one.
8686* A Claude Science message on Windows says the app was not installed because the file could not be confirmed: the copy you opened still runs but isn't installed. Download the installer again from [claude.com/product/claude-science](https://claude.com/product/claude-science) and open the new file. If the message persists, the PC could not verify the publisher's signature, so ask your IT team.
8787* The Windows app reports that it couldn't set up the app window engine: the first launch downloads that engine from `downloads.claude.ai`, and this usually means the app couldn't reach it. Check the internet connection, and on a corporate network ask IT to allow that domain (see [Network requirements](/docs/claude-science/network-requirements)).
88* On Windows, environment builds or other features fail and the PC doesn't have the Microsoft Visual C++ Redistributable (x64): install the latest supported x64 version from [Microsoft's download page](https://learn.microsoft.com/cpp/windows/latest-supported-vc-redist), then quit Claude Science from its notification-area icon and open it again.
8988* Linux refuses to start: a sandbox dependency is missing (install bubblewrap and socat as shown in the Install section), too old, or blocked. Check your bubblewrap version with `bwrap --version`, then match the error message to its fix in the [Linux troubleshooting table](/docs/claude-science/run-on-remote-linux-server#troubleshooting).
9089* Projects from another computer don't appear: by design, Claude Science keeps your work on the computer where it's installed, so each computer starts with its own projects. Your earlier projects are still on the other computer. See [Use Claude Science on more than one computer](/docs/claude-science/multiple-computers).
9190* Sign-in stops at claude.ai: your account is on the Free plan (upgrade required), the redirect couldn't return (use Paste a code), or your Team or Enterprise organization hasn't [enabled Claude Science](/docs/claude-science/enable-claude-science) yet.