Metatrader tends to copy DLL files located in the main program folder into the associated data folder whenever a new MT4 build is released.

If the plug-in you are using signals "Error - Incorrect DLL Version (20141008.1)" or similar, you should do the following:


Go into your mt4's data folder* and into MQL4/Libraries sub folder.

You'll need to delete the old duplicate DLL files. Depending on the plug-in you are using this will be one of the following (or both):


Renko Plug-in:
RangeBar plug-in:
PointO plug-in:
MedianRenko plug-in:

RenkoCore.dll

RenkoEngine.dll
RangeCore.dll
RangeEngine.dll
PointOCore.dll
PointOEngine.dll
MedianRenkoCore.dll
MedianRenkoEngine.dll


*) Data folder is accessed from MT4's File menu -> "Open Data Folder":