Hi,
In this CSV file there is one line where the date is a string "UNKNOWN_DATE_TIME". This is causing Tacview to fail to load the file. Just delete that line and the CSV will work. (at least it does for me!)
We will improve Tacview to be able to handle a case like this in the future.
Note that your CSV file includes the data of several flights from February 2020 to October 2020. You may want to break that up into one flight per file.
