하이시에라에서 설치 가능한 프로그램(포토샵, 일러, 인디자인)을 다운

Adobe expects Creative Cloud customers to have the latest equipment & software, no more than 2 versions back.  You need to upgrade your operating system.

Make sure your computer meets the minimum CPU & GPU requirements. Most Creative Cloud apps work on:

• Windows 11, Windows 10 versions 21H2, 21H1, 20H2, 2004, and 1909 (LTSB branches are not supported;)
• macOS 12 (Monterey), macOS 11 (Big Sur), macOS 10.16 or 10.15 (Catalina).

- https://helpx.adobe.com/creative-cloud/system-requirements.html
- https://helpx.adobe.com/photoshop/system-requirements.html
- https://helpx.adobe.com/photoshop/kb/photoshop-cc-gpu-card-faq.html

Please take a look here: Install previous versions of your Creative Cloud apps (adobe.com)

If this doesn't help goto DDL Articles at ProDesignTools. There you'll find older version of Adobe applications.