OwnCloud add-on thread

I've attempted this but each time I get to the point of executing the tarball I receive an error that there is no such file (I do replace the generic "latest version" with the correct name). At first I thought this was because the instructions are not specific to a Duo v1, but WSJ has had success with the same model. I'm obviously missing something but am not familiar enough with the unit (or Linux) to know what it is. I'm taking for granted that the download is saving to the folder I'm in at the time I do it (tmp) and the fact that there's no path stated in the instruction tends to back that up. Am I wrong on this? What can I do to get past this roadblock?