innoSetupInstallerPath top-level property
The path where the innosetup-6.3.3.exe file will be downloaded.
This path is computed by joining the tempDir with the last component of
the innoSetupUrl.
Example: If the tempDir is C:\Users\username\AppData\Local\Temp, then
the innoSetupInstallerPath will be
C:\Users\username\AppData\Local\Temp\innosetup-6.3.3.exe.
Implementation
String innoSetupInstallerPath = join(tempDir, innoSetupUrl.split('/').last);