The only remainig problem is, that the calculation included is not exactly the same as I described, I need a slightly different equation, it seems to me that in #23 there is an equation: [Log(F1) - Log(F1-1)^2)] * 100, but I rather need:
Y_i = {[Log (X) - Log (X-1)] * 100 }^2 and then the summary of all Y for i=1,...,I; if I itemize it:

1)equation in column K: K= log (F)
2)equation since column L2: L2=[100*(K2-K1)]^2, this equation is made accordingly in the whole column L, except cell L1, i.e. L3=[100*(K3-K2)]^2; L4=[100*(K4-K3)]^2;...
Do you mean
Y_i = {[Log (F) - Log (F-1)] * 100 }^2

Maybe this
  'Replace file line with Log of 6th value. Split(BlahBlah)(5)
                Formula1LinesArray(Fl) = Log(Split(Formula1LinesArray(Fl), ",")(5)) 'Column F
                 'After the first line... Formula1Result = Sum
                If Fl > 0 Then Formula1Result = Formula1Result +  _ 
                (Formula1LinesArray(Fl) - Formula1LinesArray(Fl - 1)  * 100 ) ^2 'Column L