Cant download html5 binaries *Resolved*

When I try to launch my project in HTML (I have firefox and chrome as options) I get the following message:
“The Binaries for this Target Platform are not currently installed, would you like to use the Launcher to download them?”

When I click yes to download them, the epic launcher tries to download but after a few seconds I get an “Errorcode IS-0001”

Can anybody tell me what I am doing wrong, or a tip/guide to get these binaries installed?

Thanks in advance.

*Edit: A reinstall of UE did the trick.