Latest version not available on Humble

[warfreak2 30]

Hi,

I bought Invisible, Inc. back in 2015 on the Humble store, and was able to get updated versions there too. Recently it came to my attention that there was an update in 2018, but I'm not able to get this from my Humble account; the most recent update there is from December 2015. There are some mods which aren't compatible with my version, so I'd like to get the 2018 update if possible. Is there a way for me to get it, or otherwise please could you upload the most recent version to Humble?

I'm playing on Linux without Steam. Thanks in advance.