The "fixed" version found on forums like Babiato typically refers to a modified version of the plugin. In the official free version hosted on WordPress.org, users are restricted to a maximum backup/import size (usually 512MB). The "fixed" or "unlimited" version usually involves:

If you are a professional managing client sites, the $69 lifetime license for the official extension is a small price for the security and peace of mind it provides. Conclusion

Modified plugins are the #1 way malware is injected into WordPress sites. A "fixed" plugin might work perfectly for migration but leave a hidden script that allows hackers to access your server later.