How to Install Photoshop 2019 version

@Karen Meets World have you thought and try using the Photoshop on the Web? I have an older MacBook Pro, and I can't install Photoshop 2025 (I could use my work's computer if I truly need too); but, I had saw and even tried to use the Photoshop online, and it works like a charm, including resizing and resampling as well! 

@Karen Meets World does this help: 

https://helpx.adobe.com/au/download-install/using/install-previous-version.html

or

https://helpx.adobe.com/download-install/kb/downloaded-older-app.html?clickref=1101lyqJpnCU&mv=affiliate&mv2=pz&as_camptype=&as_channel=affiliate&as_source=partnerize&as_campaign=prodesigntools

There's a link to the 2018 downloads, but that's as far back as they go.  I read that Jim, who runs that site, has a good relationship with Adobe, so they are happy that he makes those versions available, and as in your case, there will be a lot of people with operating systems and/or hardware, that are unable to run current versions. 

https://prodesigntools.com/adobe-cc-2018-direct-download-links.html

https://prodesigntools.com/adobe-direct-download-links.html

I hope this helps

neil barstow - adobe forum volunteer,

colourmanagement consultant & co-author of 'getting colour right'

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Most likely, you have not been use the same resampling options when resizing in the different versions.

As far as I know, there has been no change in these options since 2019.

You might have been using Bicubic Sharper in the 2019 version, which will probably give you the sharpest result for reduction. (although many of us find it too sharp, and use Bicubic (smooth gradients) instead)

Another possibility is that you have not been consistently viewing the image at 100%.

To assess sharpness and other image detail, you must view the image at 100%, where one image pixel is represented by one screen pixel. Any other view will be inaccurate and misleading because the image has been scaled.

[Moved from the Premiere Pro forum to the Photoshop ecosystem forum.]

The installers for those older version are not available. 

Whenever you resize a clip or photo beyond 100% you will lose quality. These days there are some very good products specifically for this. Check this out for instance: https://www.topazlabs.com/