The proceedings are availble in the following links:
ISWC 2020, Part I, LNCS 12506: https://link.springer.com/book/10.1007/978-3-030-62419-4
ISWC 2020, Part II, LNCS 12507:https://link.springer.com/book/10.1007/978-3-030-62466-8
Note that there is a free access until 30th of November, 2020.