Legacy CS5 was built to run on WinXP, Vista, Win7 or macOS X (10.5.7) all of which are dead now. There's no guarantee that unsupported software will work on modern Windows. And there's zero chance of it working on a modern macOS.
MODERN OPTIONS: ============== FREE Acrobat Reader https://www.adobe.com/acrobat/pdf-reader.html FREE Online PDF Editor https://www.adobe.com/acrobat/online/pdf-editor.html\ Paid Acrobat (Standard, Pro or Studio) https://www.adobe.com/acrobat/pricing/compare-versions.html Photoshop Elements or Premiere Elements (3 year license, no subscription needed). https://www.adobe.com/products/photoshop-elements.html Creative Cloud Annual Photography plan. https://www.adobe.com/creativecloud/photography.html FREE or Paid Adobe Express https://helpx.adobe.com/express/using/express-overview.html Creative Cloud Bundles & Single Apps for mobile, web & desktops https://www.adobe.com/creativecloud/plans.html
See system requirements. Most Adobe apps work on these systems, no more than 2 versions back:
Windows 11 (64-bit) versions 24H2, 23H2; Windows 10 versions 22H2, 21H2;
MacOS 15 (Sequoia), 14.7 (Sonoma), 13.6.7 (Ventura).
- https://helpx.adobe.com/creative-cloud/system-requirements.html NOTE: MS is ending Win10 in a few weeks. Apple will release Tahoe later this year.
Hope that helps.
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