Many file-hosting services have a 2GB file size limit for free users.
Always start with the first file. Right-click ER_2GB.part01.rar and select "Extract Here" . ER_2GB.part04.rar
When downloading game archives like this, always ensure you are using a reputable source and scan the final extracted folder with updated antivirus software to protect your system from malware. Many file-hosting services have a 2GB file size