how unpack the ventoy gz package?

[Richard]

I searched but probably didn't use correct terms.

I know I unpacked it last year but it isn't working now? on the same 21.3 install.

I have 7z, gzip and whatever is installed with the distro. It worked before.

Thanks for your time and tips.

[Eadwine Rose]

You should know, that with all requests, as per forum rules (which, if you haven't, please read), please share your full Quick System Info, do not edit.
If need be, you can do this using the LiveUSB, thanks.