Some Developer preview participants are seeing Error code: 10003 when trying to install the preview client on Windows.
Please take the following steps to resolve
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Right click the install package
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click view cert. select cert path and then select the root cert. then click view cert.
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click install.
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install as a admin in the local machine.
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select place all.
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select trusted root cert.
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then click ok, next and so on.