Ich muss den Link zweimal anklicken, weil der Download beim ersten Mal nicht funktioniert.

Because den Link is the direct object of anklicken.

• der Link = nominative, used for the subject
• den Link = accusative, used for the direct object

In this sentence, Ich is the subject, and the thing being clicked is the link, so German uses the accusative: den Link.

Since Link is masculine, the article changes:

• nominative: der Link
• accusative: den Link

Because it comes with the modal verb muss.

In German, when a modal verb like müssen, können, wollen, etc. is used, the other verb goes to the end in the infinitive form:

• Ich klicke den Link an.
• Ich muss den Link anklicken.

So anklicken is not split here because it is an infinitive following muss.

Zweimal means twice or two times.

Yes, you may also see zwei Mal written as two words. In modern usage, zweimal is very common and often preferred as a single word.

Similar examples:

• einmal = once
• dreimal = three times
• viermal = four times

So den Link zweimal anklicken means to click the link twice.

Because weil introduces a subordinate clause, and in German, subordinate clauses are separated from the main clause by a comma.

Main clause:

• Ich muss den Link zweimal anklicken

Subordinate clause:

• weil der Download beim ersten Mal nicht funktioniert

This comma is required in standard German.

Because weil sends the conjugated verb to the end of the subordinate clause.

Compare:

• Main clause: Der Download funktioniert nicht.
• Subordinate clause: ..., weil der Download nicht funktioniert.

This is one of the most important German word-order patterns:

• in a main clause, the conjugated verb is usually in second position
• in a subordinate clause introduced by words like weil, dass, wenn, obwohl, etc., the conjugated verb goes to the end

Beim ersten Mal means the first time or more literally on the first occasion.

It is made of:

• bei dem → contracted to beim
• ersten = first
• Mal = time / occasion

So:

• beim ersten Mal = the first time
• literally: at the first time/occasion

This expression is very common in German:

• Beim zweiten Mal hat es geklappt.
• It worked the second time.

Because erste is being used as an adjective before the noun Mal, and adjective endings change depending on the article and case.

Here you have:

• bei dem Mal → beim Mal
• that puts Mal in the dative
• with dem
  • a masculine/neuter noun in dative, the adjective usually takes -en

So:

• beim ersten Mal

Since Mal is neuter (das Mal), and the phrase is in the dative because of bei, ersten is the correct form.

Yes. Download is a commonly used borrowed noun in German, especially in technology and everyday computer language.

It is treated as a masculine noun:

• der Download
• den Download
• dem Download

German often borrows English tech words, but gives them grammatical gender and uses them like normal German nouns.

In this sentence, nicht negates the verb phrase funktioniert.

In subordinate clauses, the verb goes to the end, and nicht often appears just before the final verb when you are negating the action or state:

• ..., weil der Download nicht funktioniert.

This is very natural German word order.

Compare:

• Der Download funktioniert nicht.
• ..., weil der Download nicht funktioniert.

So the position of nicht is tied to what is being negated and to the fact that the verb is at the end in a weil clause.

Yes, often you can, especially in informal speech. But anklicken is very common when talking about clicking on something on a screen.

Roughly:

• klicken = to click
• anklicken = to click on something

In computer-related German, anklicken often sounds a bit more precise because it clearly takes an object:

• den Link anklicken
• die Datei anklicken
• den Button anklicken

So anklicken is a very natural choice here.

Because the first part of the sentence is a main clause, and in German main clauses the conjugated verb normally goes in second position.

Structure here:

• position 1: Ich
• position 2: muss
• rest of the clause: den Link zweimal anklicken

This is the standard German verb-second pattern:

• Ich muss arbeiten.
• Er kann kommen.
• Wir wollen gehen.

So muss is in second position because it is the conjugated verb of the main clause.