Windows Ent is the Enterprise version of Windows -- and as far as I know, HP does not preload that version on their laptops.
Additionally, with Windows 10, MS changed their policies and does not SELL the Enterprise version to folks; thus, the only way legally to get it is through a Home Use Program with a company that has such a license for its employees.
Therefore, what you need to do is contact your employer where you got this Windows version for their support.
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