Моцарт - Sergey Mazayev, The Sergey Mazaev Orchestra Sheet Music - Ukulele.Tab

Arrangements differ in the set of parts and what performance method they are prepared for. Briefly:
Guitar.Chords: Chord symbols for accompaniment.
Guitar.Chords&Tabs: Chords + tablature of the accompaniment.
Guitar.Tabs: Full guitar texture in tablature (includes staff and tabs, chords above the staff).
Guitar.Tabs(Easy): A simplified version of Guitar.Tabs for beginners.
Guitar&Vocal.Tabs: Vocal line with text + full guitar accompaniment in tabs.
Violin: Melody (usually without text), chord hints possible.
Ukulele.Chords&Tabs: Simplified accompaniment for playing with vocals; the vocal melody is not included.
Ukulele.Tabs: All main parts arranged for ukulele: includes staff and tabs, chords are indicated above the staff.
Ukulele.Tabs&Vocal: A version for ukulele with a vocal line and ukulele tablature (available among alternatives on the piece’s page).

Ready-made files for ukulele in PDF format (suitable for printing); you can optionally choose a version with MIDI. After payment, the download link is sent to the email provided during checkout. The page explicitly states: "The price includes a PDF for printing", formats "PDF, MIDI" are available, and "We will send the paid sheets to your email".

The "Ukulele.Tabs" type are simplified sheets designed also for beginners: the parts are arranged so they can be mastered at the start, while the main elements of the piece are preserved.

As a rule, the link arrives within ~5 minutes of payment; in个别 cases, according to the offer, the sending time can be from 1 minute to 24 hours. If there’s no email, check spam and go to "Account Dashboard" → "Order Status", where download is available.

MIDI is not mandatory but convenient: it can be listened to on a synth/in notation software, you can see which note is playing at the moment, and use it for learning (including if the instrument has a "learning function").

Yes. The site explicitly states that you can write to support—they will make changes to the sheets (e.g., transposition). If you need individual material preparation, the service has a custom sheet music creation/revision service—"we make sheets in 3 days".

Yes. A PDF for printing is included in the purchase—you download the file and print it in the desired format.

The service advertises a "100% money-back guarantee". If critical issues are found that prevent using the file, replacement or refund is possible; to initiate the procedure, simply email the address indicated on the site.

A free "chord player" is available on the arrangement page for independent work. A video lesson for this piece is announced but currently "not ready"—you can submit a request to speed up its release.