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Symptoms:
After installing, the user cannot activate and receives the following error: "An item with the same key has already been added. Key: Accept-CH".
This is caused by the installer being unable to add critical keys to the machine's registry.
Resolution:
1. Close V10
2. Download this zip folder: https://timetablingmainsite.blob.core.windows.net/files/TDSURLs.zip
3. Right-click to extract the contents, then double-click the extracted file
4. Click Yes and OK to the messages that will appear about adding content to your registry
5. Open V10 and attempt the activation