If the csv files have been renamed by sierrachartfeed to ".imported", then all the data in them is already in the Sierrachart SCID file; the ".imported" files and ".csv.gz" files should be deleted after successful import (unless you have a specific reason you might use them again soon; they are obsolete after four days). You can ignore the "no CSV history file found" message - it is not an error in this case, just a normal procedural message.

You will get the big *danger* error message (like four posts above) when there is an actual problem that requires you to re-download a new CSV (because the bitcoincharts API only has five-day-old and newer data).

The csv files inside the gzips actually start with a period, like ".bitstampUSD.csv". I've done a few tricks to look for the csv either with or without a period at the start.