If you have acquired the ISO or archive, note that it was built for Windows XP/Vista/7. Installing it on Windows 10/11 requires workarounds. Here is the standard approach for enthusiasts:
is a specific incremental release from the Australian developer Otaku Software Otaku Software DeskSpace v1.5.8.9 Retail-TCi
DeskSpace is a virtual desktop manager designed to organize your workspace by providing six distinct desktops, arranged on the faces of a 3D cube. The "Retail-TCi" designation in the filename typically refers to a specific cracked or retail release by the group TCi, indicating this is the full paid version (no trial limitations) as it appeared on file-sharing sites in the late 2000s. If you have acquired the ISO or archive,