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Something here... No, seriously, I really do not know what to write here.
This is the tiny scripting file changed by me. But it will make your SDK launcher more refined and beautiful. Read How To Install here:
Unpack here: (your local disc)\Steam\steamapps\common\portal 2\bin\sdklauncher
For example it can be:
"D:\Steam\steamapps\common\portal 2\bin\sdklauncher" or