nunmehr
now
Expresses that something applies from this point onward; now. Used mainly in formal or written language.
Die neuen Regelungen sind nunmehr für alle Mitarbeiter verbindlich.
The new regulations are now binding for all employees.

now / hence
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now
Expresses that something applies from this point onward; now. Used mainly in formal or written language.
Die neuen Regelungen sind nunmehr für alle Mitarbeiter verbindlich.
The new regulations are now binding for all employees.

'Nunmehr' (now / hence) is a word used in formal written language. You often find it in official documents, legal texts, or administrative language. It is almost never used in normal everyday conversation.
Der Antragsteller hat die erforderlichen Unterlagen eingereicht und erhält nunmehr die Genehmigung.
The applicant has submitted the required documents and now receives approval.
As an adverb, 'nunmehr' can stand in different positions in the sentence. If it is in position 1, the conjugated verb follows immediately. If it appears inside the sentence, it usually stands after the finite verb.
Nunmehr gelten die neuen Gesetze.
The new laws now apply.
The meaning depends on the context. If it is about a change in time or a new state, 'nunmehr' means something like 'from now on'. If it describes a logical conclusion, it means 'as a result'.
Nach langer Krankheit ist er nunmehr wieder gesund. (zeitlich)
After a long illness, he is now healthy again. (temporal)
The word is a compound of 'nun' (now) and 'mehr' (more). You can think of it as a formal and intensified version of 'nun' (now).
Die Frist ist abgelaufen, eine Bewerbung ist nunmehr nicht mehr möglich.
The deadline has passed; an application is now no longer possible.
now
'jetzt' and 'nunmehr' can both express that something applies from this point onward or that a new state has been reached. 'jetzt' is the normal word in everyday language. It is used in speech, in messages, and in simple explanations. 'nunmehr' sounds much more formal and written, for example in reports, contracts, or official texts. It can also emphasize a consequence: something has happened, and therefore something new now applies. Learners may confuse the words because both can often be explained with 'jetzt'. In everyday language, 'jetzt' is almost always more natural; 'nunmehr' is more suitable in official or elevated texts.

Nach der Renovierung ist das Gebäude nunmehr wieder geöffnet.
After the renovation, the building is now open again.
Wegen des Wetters fahren wir jetzt doch mit dem Bus.
Because of the weather, we're going by bus after all now.