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I am currently using Photoshop 26.3 Beta version yet whenever I open or start a new file I get "A new version of Photoshop Beta is available" with a button "Download Now" So when I pressed the button nothing happened.
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Hi @leeingrove
Try resetting Prefs for the Beta:
/Users/yourname/Library/Preferences/ Photoshop Beta Settings (Mac Ventura)
/Users/yourname/Library/Preferences/Adobe\ Photoshop\ \(Beta\)\ Settings (Mac)

C:\Users\user name\AppData\Roaming\Adobe\Adobe Photoshop (Beta)\Adobe Photoshop (Beta) Settings
Launch BETA Photoshop While Pressing The Keyboard Shortcut
With Photoshop closed, press and hold Shift+Ctrl+Alt (Win) / Shift+Command+Option (Mac) on your keyboard and then Launch Photoshop the way you normally would.
https://helpx.adobe.com/photoshop/using/preferences.html#Manually 
Thanks,
Cory - Photoshop Product Manager
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Cory is the expert on this, as he helped writing the program, but I am going to be cheeky and say what I do when I see thge Update message, as I can remember clicking the button inside Photoshop, and 'apparently' having nothing happen.
I close Photoshop.
Open the Creative Cloud Descktop App
Click on Apps.
And I'll see Photoshop Beta at the top of the page, and an invite to update it.
I did that earlier today, so my screen looks different.
What are your Manage auto-updates settings?
Do you have auto-updates turned on?