I wanted to avoid giving details, but who cares?

Get the ISO from here (it's a magnet link, load it using a BitTorrent client):

    magnet:?xt=urn:btih:6faec726c7bbb9248b3a3ed8d77bd1a7c4598f05&dn=en_windows_10_enterprise_ltsc_2019_x64_dvd_74865958.iso&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Fzer0day.ch%3A1337&tr=udp%3A%2F%2Fopen.demonii.com%3A1337&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Fexodus.desync.com%3A6969

Install it (burn it to a USB drive using Rufus, for example, or to a DVD). Then use a KMS key and one of the many public KMS servers that let you activate Windows without having a key. Cmd as admin:

    slmgr /ipk M7XTQ-FN8P6-TTKYV-9D4CC-J462D
    slmgr /skms kms.digiboy.ir
    slmgr /ato

Then reboot.