Can you elaborate on why it has to be offline? If it’s concern of data, as noted in How .rpt Inspector Online works, we never touch the report data and your reports never leave your computer, .rpt Inspector Online only retrieves information about how the Crystal Report is designed – its objects and properties (known as meta-data)
Yes, both .rpt Inspector Enterprise Suite and .rpt Inspector Professional Suite do support doing impact analysis but both products have been in End Of Life status for some time, have operating system limitations (i.e. Windows 7 or 10 not supported) and have Crystal Reports limitations (while they can work with Crystal Reports 2016 reports, you’d need to have Crystal Reports XI Release 2 installed for that to work). There’s guides on how to do it here: Analyzing which fields are used in your Crystal Reports and Analyzing which tables are used in your Crystal Reports