can i install a previous version application ?

Hi
on some application i have the possibility to disinstall update

but on other i haven't it

well i guess the uninstall update works only with the apps bundle with the device

well i used a music player very cool BlackPlayer Music Player http://ift.tt/1WvYxMb

few day ago i got an update, because on the previous version had a bug in the widget

the new version did a mess , sometime it crashes when i get a notification or a call

well is there a way to install the previous on google play?

i'm worried about thirdy sites because they don't release the hash

thanks

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can i install a previous version application ?