Asking here because of active users here

Mr. Moffat answered your question in this forum already.
Yes, you may use the Specimen paper.
You cannot illegally download study texts and kits.
Those must be legally purchased from the publisher.
You can use the materials provided on the ACCA official website.
You should use the current Specimen paper found in the ACCA site.

Of course you can!! Read the last line of Suf23’s answer!!

The ACCA publish specimen exams on their website for anyone to use – they are simply an example of the style of the exam.

However simply using the specimen exam for practice is nothing like enough practice. You must buy a Revision Kit from one of the ACCA approved publishers because they have lots of exam standard questions (including the specimen exam) to practice on, and practice is vital.

(And I don’t know what you mean by ‘asking here because of active users here’! If you ask questions in the F1 Ask the Tutor Forum then our F1 tutor will always answer 🙂 )