Es posible tener Lightroom 6 si nunca lo he tenido antes?

Some facts about Lightroom v6.14 :

You can no longer buy a licence to use.

You can transfer a Licence from another user- TRANSFER LICENSE 

Buying a licence from another owner is very prone to fraud or scams. (I would have the transfer forms authorised by Adobe before any payment!)

Do not install the Adobe Creative Cloud Desktop App as this will change v6.14 to a Subscription version (30 day trial unless subscribed).

v6 is Falling Apart- Petapixel article

v6 End of The Road Draws Nearer?

My suggestion- While you cannot update your computer, it will be less hassle to use other (compatible) software apps. When you have a new computer, the Photography Plan is the way to the future.

I have an Air High Sierra 10.13 Macbook, so Lightroom 6 is the only supported version.

If you look at the current document for Lightroom Classic System Requirements, then, yes, it will not install on your MACOS.

ref:

Lightroom Classic system requirements: ADOBE

However, if, in that referenced document you click on "System requirements for earlier releases Lightroom Classic system requirements | earlier releases" 

You can read an alternative document giving you links to earlier system requirements.

ref:

Lightroom Classic system requirements | earlier releases: ADOBE

And if you click on Lightroom Classic 9.x system requirements

you will be presented with a document that states you can run LrC v9

ref:

Lightroom Classic 9.x system requirements: ADOBE

To install Lightroom Classic v9, requires that you pay Adobe for a plan, in this case the Photography plan. You then install the Adobe Creative Cloud Desktop App, and You use the Adobe Creative Cloud Desktop App to install what you paid for. The Adobe Creative Cloud Desktop App will only show versions that are compatible.

The Adobe Creative Cloud Desktop App is free. In your language search the Internet for Download Adobe Creative Cloud Desktop App.

As I understand it, without paying upfront for a subscription, you can use the Adobe Creative Cloud Desktop App to install a trial version. BUT, their may be issues later if you need to reinstall your old v6

Can other mebers please add on or correct this?

Adobe does not sell licenses to Lightroom 6 any more. (And I don't think anyone else does either)

Tengo un Macos Hig Sierra 10.13 y quiero descargar lightroom, sin embargo, la única versión que adove me ofrece no es compatible y las versiones antiguas no están disponibles. Ya seguí todas las indicaciones de adove para descargar las versiones antiguas a traves de Creative Cloud App o el sitio web y ninguna me fue util porque simplemente las versiones antiguas no existen ni son ofrecidas. Y entonces, solo me queda la opción de comprar un computador nuevo y más moderno, lo que me es financieramente imposible...

Mi pregunta para adove es: Cómo pretenden que no se descarguen versiones piratas, falsas y riesgosas?