I have reinstalled my windows recently. So now all the saved licenses have been lost. I don't know how to use my license again.
Normally you need to transfer the license away before a reinstall of Windows (if possible). See the Zemax Licensing policies to see how the license works and how to secure the license from loss in future.
I see a transfer of your license a week ago, are you up and running or do you need help?
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