I\'ve installed Sqldeveloper Version 19.1 64-bit Version on an enterprise PC with Win7-64bit.
It works fine with embedded jdbc-client, but I need to get it working u
Without admin privileges and no permission to change your %PATH% env permanently, you only need to install the whole directory somewhere and add a .BAT file, that changes environment temporarily before calling SQL-Developer.
C:\myprogs\sqldeveloper
C:\myprogs\instantclient_12_2
C:\myprogs\sqldeveloper\startsqldev.bat
with following content:set PATH=C:\myprogs\instantclient_12_2;%PATH%
REM start sqldeveloper
"C:\myprogs\sqldeveloper\sqldeveloper.exe"
It works for versions > 20 as well ;-)