I cannot continue the download dmg files

To perform this action will require booting from a Bootable Installer. 

The Bootable Installer can Only be performed on an Apple Computer 

This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of El Capitan would have to be done on a computer that Qualifies to run El Capitan.

OS X El Capitan - Technical Specifications

Notation: If the computer being used to perform this action is Too New or Too Old to qualify to run the version of macOS - this computer can not be used.

Alternative is, to gain access to a Qualifying Apple Computer from a family member, friend or associate.

r0mpan wrote:

https://discussions.apple.com/content/attachment/c43bb271-d93e-43d8-9139-8fb7a03c67f6

I am downloading a dmg file from safari, and then after the web download it cannot continue it just says "This type of OS X 10.quick cannot install on this device." So what can/should I do?

Does not sound compatible.

Paint a bigger picture of what you are trying to accomplish...

ref: What to do before you sell, give away, or trade in your Mac

This version of OS X is either too new, or too old to be installed on your MacBook. What is your MacBook type? You can find this via the apple logo in the menu bar, and then click about this Mac