Please do not mix end of support and end of sales. If Customer (as in our case) doesn't have Volume Licence agreement with MS, only option to get required Windows 10 Enterprise LTSC licence is to buy Windows 10 Pro and then upgrade to Windows 10 Enterprise LTSC. But Windows 10 Pro isn't availabba anymore for sales in MS channel. On MS webpage it is possible to purchise till 31st January 2023. There is no way to get required license after that date.