I retested again... Now it's good.
What's certain: The 64bit CLS filter is completely inoperable.
During the afternoon test, during packaging, the 64bit version of XTOOL v0.12 was used (which I wrote as "xZLib"), including the hif/raw*.dll and zlibwapi.dll files. During unpacking, the 32bit version. (From the Xeon PC.)
Furthermore, the unpacking/testing via the "aDDeX.exe" file runs without error, with the 32bit CLS file, although not completely, similarly to the previous case. If there is no xZLib at the beginning of the packaging chain, then there is no error, strange mode. In one of the two smaller images you can see this (test from laptop) + the 64bit CLS error, in the larger image, the other test case.
For those who are experimenting, here is the small prepared package, in the "DATA" folder in the "pack" folder, copy at least 100-500MB of data or even more. Copy/move the created "data.arc" file to the other 3 folders, running the tests one after the other.
For those who don't have enough, you can also copy additional pre- and other compressors to the folders, expanding and editing the "arc.ini" files accordingly, for experimentation. Or add them to the existing test/compressor sets and test them. (eg: Tiny Compressor, Diskspan GUI, etc...)
Plus info: The 32bit CLS-filter, running from XP! (Goood!)