id say 97% to 99% of broken attachment and images was solve by just reuploading the whole "files" directory in binary. also used winscp instead of filezilla which I used at first.(was able to vie the inline picture from old tickets and even re download old attachments, that was either missing or non downloadable)for migrating from windows to linux, same version1) Upload all files, best to use a reliable FTP client (in binary mode)2) update DB name, password in the "/include/ost-config.php" especially since most public servers are shared3) login and reconfigure settings in admin panel, site location and emails