Help/Support Unable to install .deb with Filza

[k1n4 438 iPhone 7 Plus 11.3]

As in my title, I tried to install two .deb files from Filza but did not work. 

 

Here are the details. 

(I'm very new to these jailbreak things so bear with me for my ignorance. )

1. I jailbroke my old device (IOS 10.3.2) just now using Meridian (public beta 6, from https://meridian.sparkes.zone). 
2. I've received some errors from Cydia regarding with title 'Database' and cannot install any tweak, googled them, says there are issues with Cydia therefore we cannot use Cydia on IOS 10 idevices. (Is it true? has it been solved?)
3. Then I turned to Filza hoping it would work. 
4. I follow this instruction (https://yalujailbreak.net/filza-ios-1033/) to install Filza on the same aforementioned jailbroken device using 'iterminal' downloaded from Apple Store.  Successfully installed but asked me to pay for Filza, paid, but then it says 'Error: Main binary was modified. Please reinstall Filza'. Well I don't know how to reinstall this thing, or even uninstall it (anyone can help me uninstall it ?) ... Anyway, I ignored the error and continue to use it. 
5. I downloaded two .deb files from IOSGODS to test, 'Jurassic Survival' () and IAP26 (). 
6. I followed the instruction, tried 'install' them from Filza. However, before I click on 'Respring', it said 'The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec()......', and when I clicked 'Respring', nothing happened. 
7. Then, I followed this , to sideload another Filza (once again, I don't know to delete the previous one, there is not 'delete' function when I press and hold on the icon. Can anyone help?). But this new Filza app always flashes out. 
8. Now I don't know what to do...

Thanks heaps in advance for any help! Cheers!