sae aebeul daunrodeuhaessneunde ajik eopdeiteureul an haesseo.

Korean often leaves out the subject when it is obvious from context.

So 새 앱을 다운로드했는데 아직 업데이트를 안 했어 usually means something like:

• (나는) 새 앱을 다운로드했는데 아직 업데이트를 안 했어
• I downloaded a new app, but I still haven’t updated it

The I is understood, so it does not need to be said.

Both are possible, but 새 앱 is more common and compact.

• 새 = new
• 새로운 = new / novel

In everyday speech, 새 + noun is very natural for simple new:

• 새 폰 = a new phone
• 새 앱 = a new app

새로운 앱 can sound a little more descriptive or emphatic, depending on context.

을/를 is the object marker. It marks the thing receiving the action.

Here, the thing being downloaded is 앱, so it gets the object marker:

• 앱을 다운로드했어 = downloaded an app

Because 앱 ends in a consonant sound, it takes 을 rather than 를.

• consonant ending → 을
• vowel ending → 를

This is made from:

• 다운로드하다 = to download
• 했는데 = did + -는데

A few useful points:

• 하다 often changes to 해
• 하였는데 contracts to 했는데

So:

• 다운로드하다 → 다운로드했는데

Here, -는데 connects this clause to the next one. It often gives:

• background information
• a mild contrast
• a setup for what comes next

So the feeling is:

• I downloaded a new app, but...
• I downloaded a new app, and...

In this sentence, English usually translates it as but because the second clause contrasts with the expectation that the app would already be updated.

No. -는데 does not always mean a strong but.

It often has softer meanings such as:

• giving background
• setting the scene
• adding contrast
• leading into another statement

In this sentence, it suggests something like:

• I downloaded a new app, but...
• I downloaded a new app, and the thing is...

So -는데 is more flexible and softer than a direct connector like 하지만.

아직 means still or yet, depending on whether the sentence is positive or negative.

With a negative, it often means not yet.

So:

• 아직 업데이트를 안 했어 = I still haven’t updated it yet / I haven’t updated it yet

This is a very common pattern in Korean:

• 아직 안 했어 = haven’t done it yet
• 아직 못 먹었어 = haven’t eaten yet / couldn’t eat yet

Korean does not match English tense forms one-to-one.

In Korean, a past-form negative like 안 했어 can mean:

• didn’t do
• haven’t done

The exact meaning depends on context.

Because this sentence has 아직, the natural interpretation is haven’t done yet:

• 아직 업데이트를 안 했어 = I haven’t updated it yet

So even though English uses present perfect, Korean commonly uses this kind of past-form expression.

Here 업데이트 is being treated like a noun, and 하다 works like to do.

So:

• 업데이트를 하다 = to do an update / to update

In that structure:

• 업데이트 = the action noun
• 를 = object marker
• 하다 = do

This is very common in Korean with many nouns, including loanwords.

So 업데이트를 안 했어 literally looks like:

• I didn’t do the update

But in natural English, it becomes:

• I didn’t update it
• I haven’t updated it yet

Because Korean can express these -하다 actions in more than one natural way.

Two common patterns are:

• 다운로드하다 → treated like one verb
• 업데이트를 하다 → treated as noun + 하다

So both of these are natural:

• 다운로드했어
• 업데이트를 했어

You could also see forms like:

• 업데이트했어
• 업데이트하지 않았어

Korean is flexible here, especially with loanwords and action nouns.

Yes. The sentence does not repeat the object because it is already obvious.

The first clause mentions 새 앱. In the second clause, Korean naturally leaves out it because listeners can infer it.

So the meaning is:

• I downloaded a new app, but I still haven’t updated it

Omitting repeated words like this is very common in Korean.

했어 is a casual, informal ending. It is used with:

• friends
• close family
• people younger than you
• casual conversation

A polite version would be:

• 새 앱을 다운로드했는데 아직 업데이트를 안 했어요

A more formal version could be:

• 새 앱을 다운로드했지만 아직 업데이트를 하지 않았습니다

So the original sentence is in casual spoken Korean.

Yes, but the meaning changes.

• 안 했어 = didn’t do it / haven’t done it
• 못 했어 = couldn’t do it / haven’t been able to do it

So:

• 아직 업데이트를 안 했어 = I just haven’t updated it yet
• 아직 업데이트를 못 했어 = I haven’t been able to update it yet

Use 못 when you want to show inability, difficulty, or circumstances preventing the action.