This bulk Uploader is based in applet and we have removed because browser no longer support it and has not much sense share something what will raise a lot of issues. That must be converted into websockets + jnpl technology. Meanwhile you could try with it
https://docs.openkm.com/kcenter/view/ok ... -tool.html
In professional version we have yet converted all the applets to jnpl + websockets and also we have introduced drag & drop with HTML5 ( I think the last option is best ). Almost time we work in professional or something related with it, and with community we correct bugs or some improvement we have done previously into professional are relased into community, this is the way on how we work. I can not predict when we will have time for community, because all our effors now are going in release of the next professional major version what we have started working the last year and we want to relase at the end of this year or al least in the first month on the next. In this scenario almost resources are on it. However you are welcome in working with community source code, I can share with you some clues about how introduce HTML5 drag & drop ( but obviously you need some expertice with JAVA ).