So I realized that I hadn't tested it with your observed problem: ini-nul should be ini=nul. I changed it to that and now it works. Thanks.

Attached is the full WINSCP log file. It has several attempts in this file, so start at the bottom.

Please attach a full session log file showing the problem (using the latest version of WinSCP).

Btw, it's /ini=nul, not /ini-nul

I'm on windows 10 and the latest version of WINSCP. I'm just trying to GET and file using standard FTP protocol. It appears to connect and then end. I don't know how to proceed. Any ideas would be appreciated.

I'm running with a script. The command line is:
"C:\Program Files (x86)\WinSCP\winscp.com" /log="C:\TaxRates\WinSCP.log" /ini-nul /script=ftp.txt

The script is called ftp.txt and contains:
open ftp://user:Password@ftp.domain.xyz/
lcd C:\TaxRates\
get -transfer=ascii TAXRTECA.csv
exit

The winscp log file has this:
. 2020-07-02 14:45:46.517 Connecting to ftp.domain.xyz ...
. 2020-07-02 14:45:46.581 Connected with ftp.domain.xyz. Waiting for welcome message...
< 2020-07-02 14:45:46.635 220-#########################################################
< 2020-07-02 14:45:46.635 220-Please upload your web files to the public_html directory.
< 2020-07-02 14:45:46.635 220-Note that letters are case sensitive.
< 2020-07-02 14:45:46.635 220-#########################################################
< 2020-07-02 14:45:46.635 220 This is a private system - No anonymous login
> 2020-07-02 14:45:46.635 USER user
< 2020-07-02 14:45:46.688 331 User user OK. Password required
> 2020-07-02 14:45:46.688 PASS ************
< 2020-07-02 14:45:46.763 230-Your bandwidth usage is restricted
< 2020-07-02 14:45:46.763 230 OK. Current restricted directory is /
> 2020-07-02 14:45:46.763 SYST
< 2020-07-02 14:45:46.817 215 UNIX Type: L8
> 2020-07-02 14:45:46.817 FEAT
< 2020-07-02 14:45:46.871 211-Extensions supported:
< 2020-07-02 14:45:46.871 EPRT
< 2020-07-02 14:45:46.871 IDLE
< 2020-07-02 14:45:46.871 MDTM
< 2020-07-02 14:45:46.871 SIZE
< 2020-07-02 14:45:46.871 MFMT
< 2020-07-02 14:45:46.871 REST STREAM
< 2020-07-02 14:45:46.871 MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*;
< 2020-07-02 14:45:46.871 MLSD
< 2020-07-02 14:45:46.871 AUTH TLS
< 2020-07-02 14:45:46.871 PBSZ
< 2020-07-02 14:45:46.871 PROT
< 2020-07-02 14:45:46.871 UTF8
< 2020-07-02 14:45:46.871 TVFS
< 2020-07-02 14:45:46.871 ESTA
< 2020-07-02 14:45:46.871 PASV
< 2020-07-02 14:45:46.871 EPSV
< 2020-07-02 14:45:46.871 SPSV
< 2020-07-02 14:45:46.871 ESTP
< 2020-07-02 14:45:46.871 211 End.
> 2020-07-02 14:45:46.871 OPTS UTF8 ON
< 2020-07-02 14:45:46.925 200 OK, UTF-8 enabled
. 2020-07-02 14:45:46.925 Connected
. 2020-07-02 14:45:46.925 --------------------------------------------------------------------------
. 2020-07-02 14:45:46.925 Using FTP protocol.
. 2020-07-02 14:45:46.925 Doing startup conversation with host.
> 2020-07-02 14:45:46.925 PWD
< 2020-07-02 14:45:46.979 257 "/" is your current location
. 2020-07-02 14:45:46.979 Getting current directory name.
. 2020-07-02 14:45:46.979 Startup conversation with host finished.
< 2020-07-02 14:45:46.979 Script: Active session: [1] user@ftp.domain.xyz
. 2020-07-02 14:45:46.979 Script: Exit code: 1
. 2020-07-02 14:45:46.988 Disconnected from server