Can i download ios 13.7 for iphone 6

You need to correctly Identify your iPhone model - Apple Support

• iOS 14.6 —> 6S / 6S Plus, SE (1st Gen and 2nd Gen), 7 / 7 Plus, 8 / 8 Plus, X, XR, XS /XS Max, 11,11 Pro /11 Pro Max, iPhone 12, 12 Mini, 12 Pro, 12 Pro max
• iOS 12.5.4 —> Final release supported on iPhone 5S, iPhone 6/6 Plus, 

Learn how to--> Update your iPhone, iPad, or iPod touch - Apple Support

adeelbhatt wrote: "I want to download ios 13.7 on my iphone 6"

It's not possible:

iOS 13 and iPadOS are compatible with these devices

...Found by searching Apple's Knowledge Base.

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