101 - Wo kann man ISP herunterladen?

The manufacturer releases a new version once a year. It should be noted that only patches are fully compatible with each other.
The patch level is the fourth digit in the ISP version number: 8.1.24.1 has patch level 1 and is fully compatible with 8.1.24.2.
However, new ISP versions are usually only backwards compatible with previous versions. 8.1 is the ISP version and 24 are minor version changes/improvements.
Backwards compatible means that 8.1.24 can access data written by 8.1.20, but 8.1.20 cannot access data written by 8.1.24.

We recommend using the latest ISP version unless there are compelling reasons (e.g. the lack of support for a very old operating system version in a new ISP client) that prevent the latest version from being used. 

ISP can be downloaded directly from the IBM website. Here you will find the links to download ISP for various operating systems:

Operating systemIBM Installation manualLRZ Installation manualDownload of the 64bit Version
macOSIBM manualLRZ manualISP 8.1.24
WindowsIBM manualLRZ manualISP 8.1.24
SUSE Linux & Red HatIBM manualLRZ manualISP 8.1.22* / ISP 8.1.24
Debian & UbuntuIBM manualLRZ manualISP 8.1.22* / ISP 8.1.24
all other Linux distributions
(ohne Support)
IBM manual-ISP 8.1.22* / ISP 8.1.24

 The following versions of the respective operating systems are currently supported:

Operating system

Versions
macOS12, 13 und 14
Windows10 und 11
Windows Server2016 R2, 2019 und 2022
SUSE Linux11, 12 und 15
Red Hat6, 7, 8 und 9
Debian11 und 12
Ubuntu14.04, 16.04, 18.04, 20.04 und 22.04

* As of version 8.1.23, the GUI client has the java-21 package as a dependency. Versions prior to Ubuntu 22.04/Red Hat prior to version 8.9/SUSE Linux 15 do not have this package in their repositories and therefore cannot use the GUI client. To use this under older versions, version 8.1.22 is recommended.