While downloading older versions like 6.77 can be helpful, it is important to understand the risks:
Sometimes the 512MB limit is further restricted by your hosting provider's server settings. You can increase the upload_max_filesize and post_max_size in your php.ini file or via .htaccess to unlock the full potential of the free version. 2. Use the Official Extension
Modern versions of WordPress (6.x and higher) run on updated databases and PHP architectures (PHP 8.0 to 8.3+). An outdated migration plugin like 6.77 can cause critical errors, white screens of death (WSD), or corrupted database serialization during the import process. How to Safely Increase Upload Limits in Current Versions