In the manual, http://zorro-trader.com/manual/en/export.htm, it says:

"For downloading and reading .t1 files, Zorro S is required"

My understanding is that once I import the data from CSV and save as .t1, I won't be able to read the .t1 file (when selecting the asset) unless I have Zorro S. It's not listed as a restriction but it is stated in the manual link you provided.