I was reading your post. I had my MacBook Air repaired. I had IPTV GSE Pro. I can’t. get the the APP to work. It keeps rejecting and will not except the username and password. double checked all info and everything in the link is correct. I had this working before the fix. Looked at my System, Security and that seemed ok. Stopped my antivirus, did a Disk utility repair, up to date on the OS. Any suggestions would be appreciated. I know on the older MAC OS, you could allow third party software install. I’m thinking it could. be an Apple thing with the newer OS. Thank you.