Are you primarily interested in or circuit simulation ? Proteus Release 8.11

Includes support for the MQTT protocol, aimed at IoT device development.

Tools like KiCad or EasyEDA are completely free and open-source for PCB design.

If you are a student, Labcenter offers discounted educational licenses.

Are you using this for ? (If so, you might qualify for a student discount). Do you need it for personal/hobbyist projects?

However, if you are looking to use the software, here is the legal and safe approach to accessing Proteus, along with features of the 8.11 version:

Finding a for Proteus 8.11 SP1 (or any, software) is generally not recommended as these files often contain malware, viruses, or spyware. Using cracked software also carries legal risks and violates Labcenter Electronics' license terms .