Hopefully we will add the ability to install Intel® XTU on non-unlocked systems with the next release. Our engineering department is aware about this request.
You may use the Intel® Processor Diagnostic Tool and/or Intel® Processor Identification Utility.
Processors — What is the Intel® Processor Diagnostic Tool?
https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProdId=1881