I come to you in time of need. You see, the file "0050-multilib-current-x86_64.sxz" is not what it seems to be anymore, there was a time where you could simply rename the extension to ".xzm" and Porteus would automatically recognize it as a module, but with the newer versions of the current file it doesn't work anymore, you get this:

I checked the md5 hash and it matched that of the file, so it's not like I downloaded a tampered file, and if anyone else wants to try and see for thyself here's the link: https://slackware.uk/people/alien-slacklive/bonus/
(I also tried mirrors from other websites and it's always the same "corrupted" message)
I read that ".sxz" is a slackware squashed xz file type, so I tried to unsquash it but to no avail:

I also tried renaming the extension to ".txz" and using the txz2xzm command but it too says the file is corrupt:

I'm assuming something changed or was removed within the new Multilib file (compared to previous versions) which makes Porteus unable to easily recognize it anymore.
Is there anything else that could be done to have current Multilib on Porteus as a module? Maybe a fully ".txz" equivalent on the web that I'm not aware of? Thank you in advance!