Hello Artem
It is not a issue on the path because "Require" command search the Luacom.dll in the good folder ,
Night sleeping was benefit , and this morning i try something
i downloaded from Lua.org website the last 5.1.43 Lua package version for windows and installed it
the error disappeared , now i have a error with the "Luacom.createobject" object pokeysdevice_dll.dll and i think now it is just a path issue
thanks to take time to answer
i forgot to give the solution
i copied from Lua folders (in Program Files (X86)\Lua\5.1) the Lua51.dll & Lua5.1.dll and replaced them in Prepar3d v2 root folder,
i also copied from Lua folders (in Program Files (X86)\Lua\5.1\clibs) luacom.dll and replace it in Prepar3d v2\modules\lua folder
i saw in the same time that my Luacom.dll changed of size (164 Kb to 168 kb)
maybe the install adapted the dll to my windows 8 pro 64bit version
i closed the post