Many VPNs offer "portable" versions or browser extensions (like Hola or Windscribe ) that don't require full system installation.
A VPN is the most reliable tool for unblocking any site. It encrypts your traffic and routes it through a server in a different location, making it impossible for your network administrator or ISP to see what you are visiting. unblock thumbzilla portable
Use a reputable provider like NordVPN or Avast SecureLine . Many VPNs offer "portable" versions or browser extensions