Currently, there is no official "free" version of InDesign CS4 provided by Adobe. While some third-party sites may claim to offer a free download, they are often unauthorized and may contain security risks.
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: While Adobe originally offered a free 30-day trial for CS4, it was never "free" software; it required a paid license for permanent use. Adobe +5 Safe Alternatives for Old Versions If you need to access InDesign legally, your options depend on your specific needs: 11 sites Adobe InDesign CS4 | Adobe Wiki | Fandom The activation servers for CS4 applications were reported to be shut down in 2021. This was confirmed by Adobe in March 2021 and d... Adobe Wiki Adobe Wiki
If you manage to find an old installer, you will likely face significant technical hurdles: Unable to install and run InDesign CS4 on my new laptop