Upgrade win10 RTM official version c disk space is not enough how to do

  
upgrade win10 RTM official version c disk space is not enough solution:
Microsoft in the Windows10 installation and upgrade process added a clever link, when the upgrade program detects the C drive When there is enough free space, not only will the user be prompted to manually clean up the space, but also provide two options:
• Insert a USB flash drive to get extra space, but it must be 16GB or more;
• Another partition or link an external hard drive to get extra space (9GB or more);
So users who use Ultrabook, 64GB Surface Pro 3, etc. can upgrade with confidence.



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