
das Upgrade
upgrade
The updating or improvement of a product, especially software or hardware, to a newer, more powerful version.
Das Upgrade auf das neue Betriebssystem ist kostenlos.
The upgrade to the new operating system is free.
upgrade
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upgrade
The updating or improvement of a product, especially software or hardware, to a newer, more powerful version.
Das Upgrade auf das neue Betriebssystem ist kostenlos.
The upgrade to the new operating system is free.

upgrade
An improvement or move to a higher level of a service or condition, for example a better hotel room or a flight in a higher class.
Wir hatten Glück und bekamen am Check-in ein Upgrade in die Business-Class.
We were lucky and got an upgrade to business class at check-in.
'Upgrade' is often combined with the verbs 'machen' (to do/make), 'durchführen' (to carry out), 'installieren' (to install, more for software), 'bekommen' (to get), or 'erhalten' (to receive, more for services).
Ich habe für mein Handy ein Software-Upgrade bekommen.
I got a software upgrade for my phone.
The preposition 'auf' (+ accusative) is used to name the new, better version. The preposition 'für' (+ accusative) describes what is being improved.
Das Upgrade auf die neue Version ist kostenpflichtig.
The upgrade to the new version requires payment.
You can easily recognize the meaning from context. If people are talking about computers, software, or phones, it means a technical update. If it's about flights, hotels, or tickets, it means an upgrade of the service.
Nach dem Upgrade startet mein Computer viel schneller.
After the upgrade, my computer starts much faster.
update
Both words can refer to an improvement or update to software. An Update usually keeps the existing version up to date, for example through bug fixes or minor new features. An Upgrade tends to mean switching to a higher or significantly improved version, though the distinction is not always clear-cut.

Mit dem Upgrade wechselte die Firma auf eine deutlich leistungsfähigere Version des Programms.
With the upgrade, the company switched to a significantly more powerful version of the program.
Das Update behebt einen Fehler, ohne die bestehende Programmversion grundlegend zu verändern.
The update fixes a bug without fundamentally changing the existing program version.