Hi, I have an original windows 8.1 retail license. After installing windows 10 (a new install, not an upgrade) using windows 10 download tool. During the installation I tried to enter the original windows 8.1 key but received an invalid key message. I pressed on "skip" and tried to enter the key after the installation was completed (no issues, the installation was very smooth and easy except the key issue) but still wasn't able to enter a my valid key and received an error 0x004e016. Can't understand why or how. Will appreciate very much any help you care to offer me in order to solve this issue. Thanks.