Let us say that Sigismund died in October 1410 after being elected king of the Romans in opposition to Jobst of Moravia. Jobst was almost 60 when he died in OTL, so he would still have likely died in 1411 regardless of whether Sigismund predeceased him. The deaths of both Sigismund and Jobst would have left the thrones of both Hungary and the Empire vacant. In OTL, Albert V of Austria was Sigismund’s successor, but in TTL, he would be only 14 years old and not married to Sigismund’s 1 year old daughter Elizabeth of Luxemborg, so Albert would not be a candidate for the vacant thrones. Elizabeth of Luxemborg would have the support of her formidable mother, Barbara of Celje, for the throne of Hungary, but I don’t see the Hungarian nobles electing a 1 year old girl as their queen. Wenceslaus, king of Bohemia and Sigismund’s brother had been deposed as king of the Romans in 1400, so I can’t see the electors re electing him king in TTL. In TTL, the landing candidate to be elected king of the Romans would most likely be Louis III, Elector Palatine and son of Rupert, king of the Romans. The vacant Hungarian throne would have possibly been filled by one of the Hungarian nobles, maybe Nicholas II Garay who was the Palatine of Hungary for over 30 years in OTL. By the way, the death of Sigismund would have butterflied away the granting of the margraviate of Brandenburg to Frederick I of Hohenzollern which would have huge repercussions to the future of Germany in TTL.
The papal schism’s resolution would depend on who was elected king of the Romans. If Louis III, Elector Palatine elected king, I suspect (based on his behavior in OTL) that he would have been able to resolve the schism in a similar way to how Sigismund did in OTL. As for the Hussites, in TTL, the attitude of Louis toward Jan Hus would be of paramount importance. If Louis were to invite Hus to a Church council under safe conduct, and actually honor that safe conduct, then it is possible the Hussite movement would have a less violent nature than what happened in OTL. However, Jan Hus would still have to go back to Bohemia and deal with Wenceslaus and/or his successor on the Bohemian throne.