While doing the Lab 1: XSS labs in the description it was written " The solution files are available at http://info.xss.labs/solutions ."
However I cant access the solution file. Can anyone please share the solution file with me.
This URL is accessible only from the VPN environment. Just to confirm, did you update your DNS configuration as they mentioned in lab guideline?
Once you have your virtual network ready, configure the following IP address as default DNS: 10.100.13.37
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IDK why but I encountered that problem too, like 2.xss.labs and 3.xss.labs are accessible, but 1.xss.labs returns not found 
Check this post Tip & Tricks for Lab/Exams Connections and dont forget to setup the DNS Server (10.100.13.37)