
letzt
last
Refers to the end of a sequence or what comes at the very end.
Das ist die letzte Haltestelle, hier müssen alle aussteigen.
This is the last stop; everyone has to get off here.
last
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last
Refers to the end of a sequence or what comes at the very end.
Das ist die letzte Haltestelle, hier müssen alle aussteigen.
This is the last stop; everyone has to get off here.

last / previous
Refers to what has just passed in time; previous.
Letzte Woche habe ich meine Großeltern besucht.
Last week I visited my grandparents.

last but not least
An idiom meaning 'finally' or 'in the end', often used to introduce a final, positive point.
Und zu guter Letzt möchte ich mich bei allen Helfern bedanken.
And last but not least, I would like to thank all the helpers.

least
Expresses the smallest degree or the lowest level; the least.
Er zeigte nicht den letzten Funken von Reue.
He did not show the slightest spark of remorse.
'Letzt-' (last) has two important meanings that you must recognize from context: it can mean the final one in a sequence or the previous one in time.
Das ist meine letzte Frage für heute.
This is my last question for today.
The adjective 'letzt-' (last) is almost always used attributively, meaning it stands before a noun and is declined. Predicative use, such as 'Die Chance ist letzt.' (The chance is last), is unusual.
Wir haben den letzten Zug nur knapp verpasst.
We only just missed the last train.
In the meaning 'vorig' (previous/last), 'letzt-' is very frequently combined with time expressions. Typical phrases are 'letzte Woche' (last week), 'letzten Monat' (last month), 'letztes Jahr' (last year), or with weekdays such as 'letzten Dienstag' (last Tuesday).
Ich habe ihn letzten Monat zufällig in der Stadt getroffen.
I ran into him by chance in town last month.
The expression 'zu guter Letzt' (last but not least) is a fixed expression and means 'finally' or 'in the end'. It is often used to introduce a final, concluding point in a list or story.
Wir haben gegessen, geredet und zu guter Letzt noch einen Film geschaut.
We ate, talked, and last but not least watched a film.
new
The „neueste Version“ is the version that was created or released only a short time ago. The „letzte Version“ is at the end of a series or is the immediately previous one, so it does not have to be the latest version available.

Bitte prüfe die letzte Version, bevor heute die neue erscheint.
Please check the last version before the new one is released today.
Bitte installiere die neueste Version, die heute veröffentlicht wurde.
Please install the latest version, which was released today.