Steam Client API Update 22nd April Breaks Many Tools

[YoYo Games Ltd.]

We're aware that Steam have pushed their latest API from beta to public and that this breaks significant portions of GameMaker: Studio in terms of calling external SDKs and build tools.

We are still in talks with Valve/Steam about resolving, and will update the known issue at http://help.yoyogames.com/entries/50884976 when we have more information.

Currently, we can only suggest putting off the Steam client update for as long as possible.

[Art]

Unfortunaly I was unaware of this issue, so I updated Steam Client last night.
Is there a way to keep working? My version is GM:S Pro and it does not even compile on Windows 7.