This software will likely not run natively on Windows 11. You may need to use Windows Compatibility Mode (set to Windows XP) or set up a Virtual Machine (XP or Windows 7) to use it.
If you are desperate, the Internet Archive (archive.org) sometimes has disk images of old Sony software CDs uploaded by users. You would need to search for "Sony ImageMixer CD" or your camera model number there. Please be cautious of viruses when downloading executable files from unofficial archives. Pixela Imagemixer Ver.1.0 For Sony Download
If you have the files but are struggling with installation on older compatible systems, Sony Support suggests copying the CD contents to a new folder on your desktop and running the install.exe or topmenu.exe while in . This software will likely not run natively on Windows 11