Hi Roman,
> cause version of JScript is much higher.
a) Note, that the code on the link is JavaScript, but not JScript. I did not check it myself, but I expect that the referenced code will work as is in TC within the JavaScript-based project (not JScript-based).
> LoadRunner and Jmeter
Both these tools are load-testing ones and thus this is their functional domain to be able to handle different authentications.
LoadComplete by SmartBear is also load-testing tool and thus it also handles NTLM authentication.
The primary domain of TestComplete is functional UI testing and thus it does not provide (direct) support for NTLM authentication because this is something that must be transparent for the human end-user.
Considering, that NTLM authentication uses hashing and encryption I would not expect a lot of its implementations via scripting.
You may contact Support directly via the https://support.smartbear.com/message/?prod=TestComplete form.
Another possible option is to search for .Net implementation of NTLM authentication and try to implement it using CLR Bridge functionality in TestComplete.