I've downloaded the sqlcl-18.1.0.zip file for use on Windows. In previous versions of sqlcl I've used a custom command (bat) file that calls the command file (sql.bat) supplied by Oracle. In this version the bat file appears to be missing, though there is a bash script. Has the sql.bat file been deprecated in favor of sql.exe? For what its worth, I like the bat file approach because I can more easily customize the sqlcl execution environment... There appear to be some significant name changes in the libraries that affect how sqlcl is invoked.
Thanks,
-SRG