Below are the original (1st attachment) and resigned (2nd attachment) versions. To use the resigned version, first uninstall the QuickPic app in your phone, and then install the resigned app and you will be fine.
(p.s. The resigned version is prepared by signing the original version with the test certificate provided in the Android SDK and then zip-aligning.)
(p.s.2 You can get the orginal v4.5.2 from the author's site here: http://alensw.com/assets/quickpic_4.5.2.apk )
QuickPic 4.5.2 Revived (by @SammysHP): This version fixes some issues encountered on newer Android versions (v7.1.2+)