App installed but not showing up and/or usable - Android Q&A, Help & Troubleshooting

Hello,
i've got a pretty weird problem i can't figure out.
I'm trying to install netflix and get a 505 error in the play store. Using an apk from unknown sources, either netflix or apkmirror, tells me the installation would be an update, but fails after trying to install.
I've tried deleting the netflix folder in /android, deleting Cache and Data from google framework, playstore and Services, download manager. Restarting the phone.
The app also doesn't show up in application manager, app drawer and play store, it just Shows the regular green install Button.
Using a Note 4 n910c, latest Updates installed, no root.
Thank you in advance for your help

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[Q] unknown error -504 during install

I have an issue installing Tripadvisor on my phone. I own a HTC M9 running ARHD10 (android 5.1, 2.27.401.1) which was clean installed. I need help installing this app; i tried everything I could think of; deleting cache and data for google play store and play services and download manager, i tried to install outside the google play store by downloading the apk, i tried to sideload with adb, through my titanium backup, through amazon marketplace, tried to install the tablet version of the app etc etc
i have reinstalled my entire phone from scratch 3x but no TRipadvisor.
The error I receive is "unknown error code during installation -504"
What else could I try ? any ideas ?
Anybody with the same problems ? A solution perhaps?
No solution but same unknown error here. I'm on Nexus 5 and android M Dev preview 2. It happens at the end of the Google Chrome app download while installing onto the device.
Clean everything I can but no luck so far.

Uninstalled Play Store by mistake, now can't reinstall it

SOLVED: Look at my answer below.
Hello,
I'm new to this forum so sorry if I put this question in the wrong category. (also, I'm french, I don't speak english very well)
I have a Wiko Lenny running KitKat 4.4.2 (in fact, "WIKO LENNY Version 8") rooted, but I don't have CWM installed.
Yesterday, I installed some apps on my phone and tried using "Lucky Patcher", because I heard that it could remove ads. The website that explained how to use it said to go in Toolbox and to click "Install modded Play Store". So I clicked it, it said "Loading.." and then showed me an error that there wasn't enough space on the /system partition, only 60-70 MB free. So, as it didn't work, I uninstalled Luck Patcher but then I saw that it uninstalled the Play Store. I searched everywhere, it's not in the launcher, not in Settings->Apps, and now when I open any google app, it says that the Google Play Services needs to be updated, that they're not compatible with my device. I tried to download latest Play Store apk from various websites, but when I install it, it loads and then shows "Application not installed".
How can I get the Play Store back ?
Thanks
EDIT: I managed to install the Play Store apk using ADB from Android SDK. But if I try to install an app (or update existing), it crashes and says "Play Store stopped working". Then I need to go to Settings->Apps and to do "Clear data" for Play Store to make it run again (otherwise it crashes at launch).
EDIT 2: After some time, it showed a notification (translated from french) "Couldn't download <insert any app name here> : Couldn't retrieve information from server {error code i dont remember}".
NIL
Solved
I solved my problem by reinstalling Play Store by using ADB, and by setting it as system app with "/system/app mover" by j4velin. Now everything works perfect ^^

Borked Android v6 install - Please Help

Nexus 5 just updated to CyanogenMod v13 based on Android v6.
After the updat got the dreaded "Google Play Services has stopped working" spaming error dialogue.
Tried wiping cache, Dalvik cache etc. No help. Unable to uninstall the app (Uninstall button greyed out). No updates to app that I can uninstall either. Tried to install the latest .apk of Google Play Services to install over the top - no dice. Install button for side-loaded apps is greyed out. Uninstalled Google Play store. Went to install side-loaded .apk of same. Blocked by greyed out install button again. Only thing I can think of to get around it is to install from zip via TWRP recovery?
Unable to copy files directly from PC either - blocked by "Cannot copy item - The device has either stopped responding or has been disconnected" error. Tried both with and without USB debugging.
Please help >.<

App can't install. Conflicting signatures.

Alright, first, I should point out that I'm not a developer, I've never worked with adb and so on. I'm posting here because I don't know where else to post.
So, I'm trying to install Tekken mobile on my phone (Galaxy S8 Exynos version, Android 7.0, rooted with Magisk and I also have TWRP). When I search the game in the Google Play store app, it doesn't show up. I have to search the play store in the browser and open it in the Play Store from there. If I press install it downloads normally, but when it gets to the installing phase, it gives me an error 910. If I try to sideload it, the apk installer fails to install it and says that the package conflicts with an existing package by the same name. But the game isn't already installed on my phone. The whole story is: I actually had the game installed and needed to update it, but the update would fail (Google Play Store error 910), so I uninstalled it and tried to reinstall it, error 910 again, I tried to sideload it and the packages are in conflict for some reason, even though the game isn't installed. Can anyone help me fix this?

App can't install. Conflicting packages.

Alright, first, I should point out that I'm not a developer, I've never worked with adb and so on. I'm posting here because I don't know where else to post.
So, I'm trying to install Tekken mobile on my phone (Galaxy S8 Exynos version, Android 7.0, rooted with Magisk and I also have TWRP). When I search the game in the Google Play store app, it doesn't show up. I have to search the play store in the browser and open it in the Play Store from there. If I press install it downloads normally, but when it gets to the installing phase, it gives me an error 910. If I try to sideload it, the apk installer fails to install it and says that the package conflicts with an existing package by the same name. But the game isn't already installed on my phone. The whole story is: I actually had the game installed and needed to update it, but the update would fail (Google Play Store error 910), so I uninstalled it and tried to reinstall it, error 910 again, I tried to sideload it and the packages are in conflict for some reason, even though the game isn't installed. Can anyone help me fix this?

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