here's what i have on all machines (including the ones with the error):
[HKEY_LOCAL_MACHINE\SOFTWARE\Itoo Software\RailClone Pro]
"LicservHost"="Lic1"
"KeepClipboardContent"=dword:00000000
"LicservPort"="16720"
"CheckTexturePath"=dword:00000001
"DynamicGeometry"=dword:00000001
"Installed"="2.0.3.230"
"LicserverPort"="16720"
"MainDir"="F:\\Max Tools\\ForestPro"
"MaxPath"="D:\\3ds Max 2022"
"StyleEditorPath"="F:\\Max Tools\\ForestPro"
"UseLicserver"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Itoo Software\RailClone Pro\LibraryDir]
"RailClone Library"="F:\\Max Tools\\ForestPro\\lib\\default1"
[HKEY_LOCAL_MACHINE\SOFTWARE\Itoo Software\RailClone Pro\LibraryMacros]
"renderer"="@fn getRendererString = (v = #(#(1,0, \"standard\"), #(0x58f67d6c,0x4fcf3bc3, \"mentalray\"), #(0x73bab286,0x77f8fd0c, \"vray\")); for i in v do if ((i[1] == renderers.current.classid[1]) and (i[2] == renderers.current.classid[2])) then return i[3]; return \"standard\"; ); getRendererString();"
[HKEY_LOCAL_MACHINE\SOFTWARE\Itoo Software\RailClone Pro\TexturePaths]
"1"="F:\\Max Tools\\ForestPro\\maps"
[HKEY_LOCAL_MACHINE\SOFTWARE\Itoo Software\RailClone Pro\MacroDir]
"1"="F:\\Max Tools\\ForestPro\\macros"