Ensure your OS version is up to date. Creative Cloud generally requires Windows 10 (version 1903 or later) or one of the three most recent versions of macOS.
The most reliable source is the official Adobe help site. Adobe maintains a specific "Download Creative Cloud Desktop App" page that includes a section for "Problems installing? Try alternative download links." 2. Choose Your Operating System download adobe creative cloud desktop app offline installer
This usually means there are leftover files from a previous installation. Use the Adobe Creative Cloud Cleaner Tool to wipe the slate clean before trying the offline installer again. Ensure your OS version is up to date
Remember that the "Offline Installer" is for the Desktop App (the hub) only. Once the hub is installed, you will still need an internet connection to download the individual creative tools (Photoshop, etc.), unless you are using an Enterprise package. Enterprise and Team Deployments Adobe maintains a specific "Download Creative Cloud Desktop