@bwilhelm it worked!
After some rounds due to the proxy, I was able to install and use, everything worked as expected.
Extracted the nightly build, disabled other updates sites, enabled zip repo and installed all the plugins (except for the chemistry plugins, I did that because trying to install straight from your zip gave an error about a missing dependency, where https: / /nodepit.com/iu/woodstox-core-asl.source informed me that it would depend on other plugins I already use inside zip repo)
After that I disabled the repo zip and pointed to its zip, installed it and said it would replace the ones that were already installed.
I restarted KNIME and boom! It worked!
Many thanks to you and the team.