هذه نسخة.

This is a simple nominal sentence in Arabic.

• هذه = a demonstrative pronoun, meaning this
• نسخة = a noun, meaning copy / version depending on context

So the structure is basically:

• هذه = subject
• نسخة = predicate

A very literal breakdown is this [is] a copy.

Because نسخة is a feminine noun.

In Arabic, demonstratives such as this must agree with the gender of the thing being referred to:

• هذا = this for masculine
• هذه = this for feminine

Since نسخة is feminine, Arabic uses هذه.

A good clue is the ending ة on نسخة, which very often marks a feminine noun.

In Arabic, the verb to be is usually not stated in the present tense in sentences like this.

So Arabic says:

• هذه نسخة

where English says:

• This is a copy

This is completely normal Arabic. The idea of is is understood automatically.

Because the sentence is identifying or classifying something: this is a copy.

In Arabic, that often means:

• the first part is definite: هذه
• the predicate is indefinite: نسخة

So:

• هذه نسخة = This is a copy

If you make the second word definite:

• هذه النسخة

that usually means this copy, not a full sentence in the same way.

You would say:

• هذه النسخة

This is a noun phrase, not the same structure as هذه نسخة.

Compare:

• هذه نسخة = This is a copy
• هذه النسخة = this copy

That difference between indefinite and definite is very important in Arabic.

A common pronunciation in pause is:

• hādhihi nuskha

In fully inflected, careful MSA, it can be pronounced:

• hādhihi nuskhatun

A few helpful notes:

• هذه = hādhihi
• the dh sound is like the th in this
• نسخة = nuskha in pause

So learners will often hear or say the shorter paused form: hādhihi nuskha.

The final ة is called tāʾ marbūṭa.

It often marks a feminine noun. In this word, it helps show that نسخة is feminine.

Its pronunciation changes depending on context:

• in pause: nuskha
• with a case ending or in certain grammatical connections: nuskhat-...

So in a fully vowelled form, you may hear:

• نُسْخَةٌ = nuskhatun

but when stopping normally, it sounds like:

• نُسْخَة = nuskha

The fully vowelled form is:

• هٰذِهِ نُسْخَةٌ

Here:

• هذه is essentially fixed in form
• نسخةٌ has ـٌ because it is nominative as the predicate of a nominal sentence

In very careful formal Arabic, this would be read as:

• hādhihi nuskhatun

But in normal paused reading and in most spoken use of MSA, learners often say:

• hādhihi nuskha

So yes, the case ending exists grammatically, but you will not always hear it pronounced in everyday use.

You can say:

• هذه ليست نسخة

This means This is not a copy.

Why ليست?

Because the thing referred to by هذه is feminine singular, so the negative form agrees with that.

Compare:

• هذا ليس كتابًا = This is not a book
• هذه ليست نسخة = This is not a copy

Not always. Depending on context, نسخة can mean things like:

• copy
• version
• edition

So the exact English word depends on what kind of thing you are talking about.

For example:

• a photocopy
• a software version
• an edition of a text

But grammatically, in هذه نسخة, it still works the same way.