Image.save() and ImageSet.save() save images for 'notebook' so that they are removed when the object is destroyed.
Image.save() and ImageSet.save() use Image.save(temp=True) for saving temporary files for notebook instead of generating paths of them manually. The function had not worked well on Windows environment because it had generated invalid (at least on Windows) paths by simply adding '/tmp/' as a prefix.
For the command 'SETX' in 'scripts/install/win/install.bat', variables are put in quotations. Without quotation, the command shell misinterprets the argument as multiple arguments if the variables include a white space. It causes an error that the command does nothing.