PyQt4 to PyQt5 how?

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The main change from Qt4 to Qt5 and hence from PyQt4 to PyQt5 is the rearrangement of certain classes so that the Qt project is scalable and generates a smaller executable.

The QtGui library was divided into 2 submodules: QtGui and QtWidgets, in the second only the widgets, namely QMainWindow, QPushButton, etc. And that is the change you must make:

[...]
from PyQt5 import QtGui, QtCore, uic, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtCore import *
[...]

Ui_MainWindow, QtBaseClass = uic.loadUiType(uifile)
Ui_Dialog= uic.loadUiType(uifile)

class About(QtWidgets.QMainWindow, about.Ui_Dialog):
    def __init__(self, parent=None):
        QtWidgets.QMainWindow.__init__(self, parent)
        self.setupUi(self)
        self.setWindowModality(QtCore.Qt.ApplicationModal)
        point = parent.rect().bottomRight()
        global_point = parent.mapToGlobal(point)
        self.move(global_point - QPoint(395, 265))

class MyApp(QtWidgets.QMainWindow, app_window_dark.Ui_MainWindow):
    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setupUi(self)
        self.about_btn.clicked.connect(self.popup)

        #prev next
        self.btn_next.clicked.connect(self.renderSet)
        self.btn_prev.clicked.connect(self.renderSet)

Note: Phonon does not exist in PyQt5, you must use QtMultimedia, an accurate solution you can find it in the following answer: Phonon class not present in PyQt5

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