What is it OOTB Excel file reader, Excel.ReadFromFile and how do I get the package?
That is the extremely old name for the import excel node which is in the standard node library. Old as in 2018, which was 5 Revit releases ago.
Try the OpenXML excel nodes in the newer Dynamo releases (2.12+ if memory serves) instead as they are much more stable as they avoid the office interop entirely (so MS cannot break them).
If you are still having issues after that please start a new topic, as I am closing this one due to the number of changes in this function since the topic started.