Proteus is commercial software owned by Labcenter Electronics. Distributing a "portable" or "cracked" version is software piracy. The only legal ways to have a portable version are:
This article does not condone downloading cracked versions from torrent sites. Such files often contain malware, keyloggers, or ransomware. Proceed at your own risk, and always prefer the official installer if possible.
In Proteus, text styles are saved within the Template, not just the individual file. If your portable version has a corrupted or default template, the text will look jagged, unreadable, or disappear.
If you need a legitimate, portable circuit simulator, consider these options: