Adobe Photoshop installation

...is it possible to install Adobe photoshop on my compaq presario cq56 laptop windows 7 (Processor of Intel celeron dual core T3500 2.10GHz)

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@ngabul5E30,

No, I'm afraid not.  You need a newer, bigger and faster computer.  Windows 10 (version 1909) or higher is needed to run Creative Cloud Desktop App which manages all CC apps.

See below for system requirements.  Check each one. Also pay close attention to Photoshop's GPU requirements.
- 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

ADOBE TOOLS for creating graphics & brochures:
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- Illustrator CC for vector graphics: https://www.adobe.com/products/illustrator.html
- Photoshop CC for raster images: https://www.adobe.com/products/photoshop.html

- InDesign CC for page layout: https://www.adobe.com/products/indesign.html

- Acrobat Pro DC for making PDFs: https://www.adobe.com/acrobat/acrobat-pro.html

NON-ADOBE TOOLS (raster & vector):
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- Affinity Photo & Affinity Designer: https://affinity.serif.com
- CorelDRAW Graphics Suite: https://www.coreldraw.com/
- GIMP: https://www.gimp.org/
- Gravit Designer: https://www.designer.io/en/
- Inkscape: https://inkscape.org/
- Krita: https://krita.org/
- Paint.NET: https://www.getpaint.net/
- PaintShop Pro: https://www.paintshoppro.com/
- PhotoPea: https://www.photopea.com/
- Photo Pos Pro: https://www.photopos.com/PPP3_BS/Default.aspx
- Pixlr: https://pixlr.com/
- Vctr: https://vectr.com/

Hope that helps.

Try it out. Take the 7 day test subscription. You need however to know that you can only use the latest version and Windows 7 is no more supported. https://helpx.adobe.com/photoshop/system-requirements.html

IMHO you do not design pamphlets in Photoshop but you use Indesign or Illustrator and Photoshop for photos as an add on tool.