Playing Survival Road 2 Sacrifice Standalone prompts me to remove the plugin before connecting to VAC protection! Please help, this hasn't happened before.

Ugh, I'm speechless, didn't you see a similar problem when you asked the question

Find the file you started the game with, it's left4dead2.exe rename it to left4dead2.exe -steam and you're good to go

There's a problem with the detection

This is the problem with detection