Ios devices that are not jailbroken cannot install any external resources (those IPA, DEB, PXL packages). After these softwares are installed on ios devices, they will be forced to shut down automatically because they cannot pass the application signature verification.

So in the genuine market, you can only use itools or itunes to install things, as shown in Figure itools:

However, can you use the software "Quick Use of Apple Assistant" now? Don't jailbreak and install any ios software, mainly because of a huge loophole in software verification. . . . Just search Baidu directly.