2017-08 update windows 10 version 1703 for arm-based phone devices, Error code (0x80070020).

My Lumia 640XL device running on Windows 10 OS version 1703, Build- 10.0.15063.414 . While checking for update a new update shows up i.e, 2017-08 update for arm based phone devices, but while trying to download the download never starts, showing an error code (0x80070020). I am using wifi to download. I can't understand the issue.

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