Copy it from there and paste it into your Cydia Impactor.
When you are attempting the Jailbreak for first time, it may reboot for a couple of times.
Step 2: Double click on the download folder to unzip it and drag the unzipped file to the Applications folder.
Uncover is a semi-untethered jailbreak which will need to re-jailbreak the device again on each reboot.
Altstore Method for Windows users Step 01 — Install iTunes from Apple sites according to your device.
And push notifications mismatch, there are other bugs and they are all fixed in version 4.