The file is corrupted.

Hello! I wanted to play on this server but couldn't. I have been trying since yesterday to fix this issue I'm having but I didn't have any luck. I keep getting the message "The file is corrupted. If it persists, please run file recovery from the launcher." when I press start.
What I have done till now:

• First I copied my BDO original files and downgraded the game with GamezBD launcher and got the message for the first time.
• Then I force checked from GamezBD launcher. It didn't help.
• Then I deleted version.dat and launched BDO original launcher and scanned the files and downgraded again afterward. It didn't help.
• Then I deleted everything and downloaded from the scratch with GamezBD launcher. It didn't help.
• Then I cried and hugged my body pillow. It didn't help.
• Then I made an exemption for whole BDO in my antivirus. Scanned the game with force check. Didn't help.
• Then I gave BDO administrative rights. It didn't help.
• Then I sold my soul to the devil. It didn't help.
• Then I copied again my original BDO again, gave it administrative rights, made an exemption for it in antivirus and downgraded. It didn't help.
• My firewall had also exemption on it all the time. I also played around with the files to be read-only or not. None of that helped.