There is no need to download it now, you can create a certificate and upload an ipa file directly with a tool on the wire.
The address of the tool is as follows:
https://www.yunedit.com/createcert
Now that you can generate a certificate, you can also upload the ipa file to the app store, and generate a test QR code for real machine testing, and you can also generate a screenshot of the interface when it is put on the shelf.
If you need to generate a test version for real machine testing, it can also help you generate a test QR code and get the udid of the test device, which is really easy to use.
Can also help you generate screenshots
