Try to use "Download with ocDownloader" in context menu for "1111" or "2222" (it's really the same URL, but in different encodings)... Popup "Invalid URL" is displayed and no download is started.
I entered the URL with spaces into the ocDownloader app and it reports it as an invalid URL, so it is not caused by the webextension. Spaces could be replaced with %20, though.
ocDownloader_webextension 1.6.2
Open it on Firefox 68.0
Try to use "Download with ocDownloader" in context menu for "1111" or "2222" (it's really the same URL, but in different encodings)... Popup "Invalid URL" is displayed and no download is started.
But urls without spaces are opened well.