"T. Valko" wrote...
Try this:

=SUMPRODUCT(--(ISTEXT($AP$53:OFFSET($BG$53,0,0,$A$10))),
--(ISTEXT($BH$53:OFFSET($BY$53,0,0,$A$10))))
....

Might look a bit cleaner as

=SUMPRODUCT(--(ISTEXT(OFFSET($AP$53:$BG$53,0,0,$A$10))),
--(ISTEXT(OFFSET($BH$53:$BY$53,0,0,$A$10))))

but if there were many of these, it could be more efficient to use

=SUMPRODUCT(--(ISTEXT($AP$53:INDEX($BG$53:$BG$65536,$A$10))),
--(ISTEXT($BH$53:INDEX($BY$53:$BY$65536,0,0,$A$10))) )

which avoids volatile functions.