This applies to older Razer Blade models that did not ship with Windows 10 already installed. For newer Blade models, ensure you have the latest Windows system updates installed. See How to receive the latest software updates from Windows.
The following steps will show you how to fix your Razer Blade if you are unable to detect any wireless or Wi-Fi connection after upgrading to Windows 10.
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Right-click on the "Start" button.
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Go to "Device Manager".

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Uninstall VPN adapters and Wi-Fi drivers found under "Network adapters".

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Click on "Scan for hardware changes" on the toolbar.

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Install the latest Wi-Fi drivers posted on the Razer Support site.