Matrix HAL installation problems

Does anybody know if the packages moved? I always get 404 and repository not signed error.

Seeing the same issue. Would love to understand if there is a workaround or recommendation. I am trying with an older Raspberry PI OS distribution (buster), which does at least allow me to add the repository successfully, but I am still getting errors when I do that building the kernels (see below)

$ sudo apt install matrixio-kernel-modules
Reading package lists... Done
Building dependency tree
Reading state information... Done
matrixio-kernel-modules is already the newest version (0.2.5).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up matrixio-kernel-modules (0.2.5) ...
Removing old matrixio-kernel-modules-0.2.5 DKMS files...

Deleting module version: 0.2.5
completely from the DKMS tree.
Loading new matrixio-kernel-modules-0.2.5 DKMS files...
It is likely that 4.19.97-v7+ belongs to a chroot's host
Building for 4.19.97+, 4.19.97-v7+, 4.19.97-v7l+ and 4.19.97-v8+
Building initial module for 4.19.97+
Error! Bad return status for module build on kernel: 4.19.97+ (armv7l)
Consult /var/lib/dkms/matrixio-kernel-modules/0.2.5/build/make.log for more information.
dpkg: error processing package matrixio-kernel-modules (--configure):
 installed matrixio-kernel-modules package post-installation script subprocess returned error exit status 10
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
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