If budget is a constraint, consider:
cscript slmgr.vbs /dli
Using a non-official KMS host server like kms.lotro.cc may pose risks to your Windows installation. These servers may not be secure, and using them to activate Windows may not be compliant with Microsoft's terms and conditions. Additionally, KMS activation may not work if your Windows installation is not genuine or if you have exceeded the maximum allowed activations. cscript slmgr.vbs skms kms.lotro.cc