Unfortunally I´m experiencing the same problem with Knime 4.
I can copy files and also create KNIME tables, using “table writer node”, in the same directory where the “unzip node” can´t. It shows the message that the directory is not writtable.
moved your question to new topic cause versions are pretty different and to get more visibility.
Is your output directory in remote location? From node description: “remote URLs usually don’t work”.
If that is not the case can you share a bit more info like error you are seeing, OS you are running, standard or batch execution…
I understood this message was related to URL like “//server-ip/resource”, but it seens it also doesn´t work for a drive (“D:”, for instance) which is mapped (by the system) to a remote location/device.
I´ve supposed it works on mapped drives as well other nodes do.
I recently had also a problem with KNMIE and unzipping (have not checked if this has been solved in 4.0), it did involve some strange files in the ZIP file I had to extract.
So I toyed around with some R packages namely archive (a wrapper for libarchive) and (well) zip. Not sure if they would work for mapped drives but it might be worth a try.
‘archive’ must be compiled and be installed via devtools so it is not a completely straightforward process. ‘zip’ seems to be fine. There might be some differences since I tested this on a Mac.