Strange. I found an image with the file name <openhdf-6.1-osminiplus-117-20170322_usb.zip> on my hard disk. Date modified says it was downloaded on 5th of April in the afternoon. However I'm not sure where I downloaded it from.
Edit: And I have a file <openhdf-6.0-osminiplus-104-20170316_usb.zip>, too. Same modified date and time but size is a bit different from the other one.