How to manually install IntelliJ IDEA patch update?

Question

I get the following connection error while updating IntelliJ behind proxy (the proxy ping in IntelliJ is working though):

Connection Error: Failed to prepare an update:

Answer 1

java -jar IU-xxx-patch-win.jar "C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2017.1"

(replace with the actual IntelliJ IDEA installation location on your system).