For permanent Activation buy a retail key for windows 8.1 For 180 days Activation without Watermark use KMS Activation for Windows 8.1
can do it forever? is there a silent comand to install automatically MTK on windows 8.1 installation DVD ?
a little bit forever is there when you read the instructions and honestly, some weeks later we are confronted with a new system 8.1+ which might need to look into, who knows. Latest W9 will require some cool MDL heads for looking into that coming up activation method ...