Our files are 100% virus free, it is possible that your anti virus picks up KiotoStory as a virus. It is a false warning.
First off, why is KiotoStory being detected as a virus?... (Click here to read more..)
Years ago, the game developers for MapleStory chose to protect their game client using an anti-tamper software called Themida. Themida was used for MapleStory to prevent hackers and reverse engineers from creating MapleStory hacks and private servers, but was eventually cracked by a group of experts.
Themida as an anti-tamper software is so good, however, that many viruses are also "packed" with it, so that anti-viruses wouldn't be able to "unpack" the viruses to detect if they were malware or not. Eventually, it was decided by the anti-virus community that files packed with Themida would be automatically assumed as suspicious, due to the amount of Themida-packed viruses roaming about the Internet.
You may ask then, "how did certain legitimate Themida-packed game files, such as the official MapleStory game files, get past anti-viruses?" Nexon was able to get their original MapleStory files past anti-viruses by digitally signing their clients with a trusted authority. Trusted authorities ensure that the file is from a safe source (a game company) and gives anti-virus software companies (Norton Anti-virus, for example) a whitelist of files that their customers (you, for example) can trust, regardless of any suspicious signals. This is why the original MapleStory clients, even though they were Themida-packed, had no issues with anti-viruses.
Unfortunately, since MapleStory private servers have no such trusted authorities to turn to in order to whitelist their game files, there's no real way to prevent anti-viruses from automatically detecting them as malware. So what can you do to prevent your anti-virus from deleting KiotoStory?
Once the issue has been clarified, it is recommended to disable any antivirus you have installed before proceeding with the installation.
Download both Setup and Client installation files
Proceed to install the Setup. The default installation folder is "C:\KiotoStory\"
After installing it if you have the antivirus activated (Windows Defender) it will surely eliminate the game launcher (Client)
Add the folder where you installed the Setup to the exceptions of your antivirus. This could vary depending on the antivirus you are using.
If you are only using Windows Defender you can use this link as a reference: Video Tutorial
(Remember to add the Setup folder you just installed, which in default would be "C: \ KiotoStory \")
Now you can install the Client in the folder where you installed the Setup "C:\KiotoStory\" (Run the Client's installer and make sure to indicate the address where you installed the Setup)
If nothing happens when you run the game or you get an error remember:
1- Our Client requires .NET Framework 4.6.1 and Visual C++ redist
2- In the properties of the executable or shortcut to run the game select: Run with Windows 98/XP/7 compatibility