Need to have XML activity for Uipath 2019.10.6

No because it’s not in .nupkg format (as would be an activity in UiPath terms). It’s in xaml format, so if you want to call it as a package you will need to open the xaml file of Paramatrix, create as a library from it (basically copy/paste the code + argument):

Then you will be able to publish it from library options, then you will be able to call the package from Manage packages at a local level

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