Yes, to convert you have to upload. You should upload to your private account and Mark it as PRIVATE so it will not be visable to anyone else.

Score Uploading Guidelines
About these guidelines
These guidelines help ensure that your scores are:
Properly titled and attributed.
Easy for others to find and enjoy.
Compliant with MuseScore's community guidelines.

These are not mandatory but are highly recommended to improve score visibility, accessibility, and searchability. Fact is you can ignor all this if you just want to covert a pdf to a .msi.

When you are done you will get this!
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