Alt-Tab in macro not always working

[Gintaras]

if act does not work, maybe there are 2 similar windows, and act finds wrong window. Look in "Explore windows", it is in QM floating toolbar, "More tools" menu. Also, to see what is the active window then, insert this in the macro:
outw win

But why wouldn't Alt-tab work?

I don't know. Anyway, Alt+Tab is not the best way to activate windows in macros.

When you say "let the exe run as admin" would that be the same as Right-click Run as admin?

Yes.