When I first click on Freestyle GunZ patcher it starts patching until it reaches like 99.5% and then it showes me this.
patchlog:

Log start : Sun Oct 15 16:059 2017

Current Directory : C:\Program Files (x86)\Freestyle GunZ
16:059:792 [APP] OS version : Windows 10 (Build 15063)
16:059:809 [APP] Window created successfully.
16:05:51:875 [ZUpdate] Create.
16:05:51:882 [ZFileTransfer] Create.
16:05:51:883 [ZFileTransfer] Create successfully complete.
16:05:51:884 [ZFileTransfer] Open connection.
16:05:51:884 [ZFileTransfer] Open connection successfully complete.
16:05:51:885 [ZFileTransfer] Change directory.
16:05:51:886 [ZFileTransfer] Change directory successfully complete.
16:05:51:886 [ZUpdate] Create successfully compete.
16:05:51:887 [APP] Download patch info file
16:05:51:888 [ZUpdate] Start update.
16:05:51:889 [ZFileTransfer] Download file : patch.xml.comp to ./patch.xml.comp
16:05:52:208 [ZFileTransfer] Download successfully complete.
16:05:52:212 [ZUpdate] Get update info.
16:05:52:231 [ZUpdate] Get update info successfully complete.
16:05:52:232 [ZUpdate] Check valid from patch list.
16:05:5266 [ZUpdatePatchNode] Needs to update : system.fgz3
16:05:53:955 [ZUpdate] Check valid from patch list successfully complete.
16:05:53:955 [ZUpdate] + Total patch file count : 1
16:05:53:955 [ZUpdate] + Total patch file size : 191723 bytes
16:05:53:955 [APP] Exist patch file(s)
16:05:53:956 [APP] Start file updating...
16:05:53:956 [ZUpdate] Patch files.
16:05:53:957 [ZFileTransfer] Download file : system.fgz3 to C:\Program Files (x86)\Freestyle GunZ\PATCH\system.fgz3_
16:05:54:155 [ZFileTransfer] Download successfully complete.
16:05:54:156 [ZUpdate] Successfully download '.\PATCH\system.fgz3_'
16:05:54:156 [ZUpdate] Patch files successfully complete.
16:05:54:156 [ZUpdate] Move patch files.
16:05:54:158 [ZUpdate] ERROR : Invalid CRC '.\PATCH\system.fgz3_'
16:05:54:158 [ZUpdate] Move patch files successfully complete.
16:05:54:159 [ZUpdate] ERROR : Cannot move patch files.
16:05:54:159 [APP] ERROR - Update fail
16:05:54:159 [APP] Updater error message :

Invalid CRC from the downloaded patch file. : .\PATCH\system.fgz3_
[Tip] Please check your anti-virus program and firewall running on your system.

16:05:54:160 [App] File transfer error message :
Tried everything you guys said and nothing is working I still cant launch the patcher.