Hello shiltzians,

Please try the following steps:
1. Locate your Seal Online system folder (C:\Program Files (x86)\SealOnline Blades of Destiny)
2. Locate the file named "version"
3. Open the file and you will see something like this :
[DEFAULT]
CUR_VERSION=FD17iSGlOEg=
4. change the text to:
[DEFAULT]
LAUNCHER_VERSION=0LpWl25s93A=
LOOP_VERSION=0LpWl25s93A=
CUR_VERSION=5b6yFE4iGCw=
5. Then save and launch your Seal Online client as usual.
6. This should have your pc download the patch all over again.

If these steps didn't help you to solve this issue, it is because is an error of your network provider and should be fixed soon.
Some players reported experiencing this issue with their network provider, if this is your case and you are still having this trouble, please get in contact with them.

Please send us a ticket so we can better assist you if you have any other concern.