[User feedback required] tumblr.com download problem

and now it's time for tumblr... what mean "Invalid download directory"? i'm loged throught Account Manager and tried three authors: javiermicheal-femaleart, balloondolls and leticialatex. same thing, JD download few pictures but in most case report that error.
EDIT for this on bottom => plus on that, JD downloaded few most images with wrong extension. some time substitute jpg with png and opposite. how or why??

log => 27.09.17 01.39.24 <--> 27.09.17 01.55.03 jdlog://1864614015941/

p.s. wow, that's stupid tumblr mess-up extensions! sorry for that