letztmals
for the last time
For the last time; refers to the final occurrence of an event or action in a series.
Die Mannschaft trat in dieser Formation letztmals vor zwei Jahren an.
The team last appeared in this formation two years ago.

for the last time
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for the last time
For the last time; refers to the final occurrence of an event or action in a series.
Die Mannschaft trat in dieser Formation letztmals vor zwei Jahren an.
The team last appeared in this formation two years ago.

The adverb 'letztmals' (for the last time) is a fixed combination of 'letzt-' (from 'letzte', meaning last) and the ending '-mals', which means 'time.' It is a compact form of 'zum letzten Mal' (for the last time).
Die Olympischen Spiele fanden hier letztmals 1972 statt.
The Olympic Games were held here for the last time in 1972.
As an adverb, 'letztmals' (for the last time) can appear in different positions in the sentence. If it is in position 1, the conjugated verb follows immediately. However, it can also stand after the verb and subject.
Letztmals habe ich ihn vor seiner Abreise gesehen.
I saw him for the last time before his departure.
This word belongs more to written language or a more formal style. It is often used in reports, news, or official announcements.
Der Künstler trat gestern Abend letztmals öffentlich auf.
The artist appeared in public for the last time yesterday evening.
last / recently
'zuletzt' and 'letztmals' can both point to the last occurrence of something. But 'zuletzt' is broader: it can mean 'at the end of a sequence' or 'the last time'. It does not have to mean that something never happens again afterward. 'letztmals' means more precisely 'for the last time' in a series and sounds somewhat more formal. Learners may confuse the words because both have to do with 'letztes Mal' (last time). If you are simply saying when something happened at the end or most recently, use 'zuletzt'. If you want to emphasize that it will not happen again afterward, 'letztmals' fits better.

Der alte Zug fährt am Sonntag letztmals auf dieser Strecke.
The old train will run on this route for the last time on Sunday.
Er war zuletzt am Montag in der Schule.
He was last at school on Monday.