Install UWP package on Windows 8.1 Pro without developers license - xamarin.forms

With Xamarin.Forms I'm developing a mobile app. In Android I get this succesfully running on a device. I succeeded to create an app package from the UWP project and install it on my own Windows 10 PC. This is also my developing machine, so it's in Developer Mode by default. So it runs here without any problems.
My purpose is to get it running on Windows 8.1 Pro (tablet size). It just needs to consume the app. When installing the app by using the script, it's throwing the error that no developers license is found. On this device I didn't found anything to put it in Developers Mode, but it seems me that this is not needed, because it only consuming the app and no developing will take place on it.
It's is an internal app, so no need to place it on the Windows Store.
So my exact question: how can I install this app on this device without setting everything up for a Developer?

The answer would be no. Windows 10 has more new API and concepts that are not available on Windows 8.1. UWP app will not backward compatible to Windows 8.1. But WRT app will be Upward compatible to windows 10. It means that the windows 8 store app could run in windows 10. for more please refer Move from Windows Runtime 8.x to UWP.

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how to publish app to apple store using windows

hi I have been created an app at Xamarin form and I want to publish them to the apps store
on the google play store that was very easy
the problem of how to publish the app on apple store if I have just windows
I know that I have to use Xcode and just on mac
I think there is some way to do that from windows
Well in fact you could do it without a Mac, installing a Virtual machine as shown in this video, after that, you should be able to download the last version of Xcode through the App store within the Virtual machine. Then, within Visual Studio in your Windows, connect with your just created Catalina VM.
After that, you colud use Testflight instead of publishing the app directly on the App store in order to build beta tests.
Regards.

Is Windows-10-Qt-quick-QML code cross-compatible with IOS

If I am developing an application using Qt quick QML on windows 10, can I deploy my project and test it on an ios device? I have read this post Developing iOS app on Windows but it seems to be somewhat in conflict with what I have read. The chosen answer in that question says that you need a macOS to develop IOS applications. Qt's documentation and other posts have said that you can port applications onto various platforms with the same code "Code once, deploy everywhere". So will I be able to actively test my qt quick QML code on an ios device from a Windows 10 development platform?
No, you can't. You need either macOS computer or virtual machine with this system.

Xamarin forms: Issue reported while submitting windows app to windows store

I have developed a Xamarin Forms(.Net standard) UWP app and submitted it to windows store, but the windows store team reject the app because of the following issue.
The app doesn’t install on one or more of the currently selected device families due to an unsupported minimum OS version. If the affected device family is not intended to be targeted, then please de-select the unsupported device family and resubmit the app. Otherwise, please change the minimum and/or target OS version that the app supports (https://learn.microsoft.com/en-us/windows/uwp/updates-and-versions/choose-a-uwp-version#choose-which-version-to-use-for-your-app)
My apps min and target versions are Windows 10 Fall Creators Update(10.0; Build 16299). I am targetting my app only for windows 10 desktop devices and windows 10 mobile devices. So what is the correct min and target versions for my app?
To Martin Zikmund:
If I downgrade target version to 15063 (Creators Update) my windows app build failed with the following error.
The solution for this error is changed the target version to Windows 10 Fall Creators Update(10.0; Build 16299), I found it here. If I changed the min and target version to Windows 10 Fall Creators Update the build will succeed.
You are probably trying to traget Windows 10 Mobile, which did not receive 16299 (Fall Creators Update) and got stuck on a sub-FCU build. To support it, you would have to downgrade to 15063 (Creators Update), but that means you can no longer use the latest versions of Xamarin.Forms which are targeting .NET Standard 2.0 which is not supported on 15063 and have to downgrade to version 2.X of Xamarin.Forms. You will also have to downgrade your library from .NET Standard 2.0 to Portable Class Library.
Practically this means that to be able to use the latest and greatest of Xamarin.Forms you will likely have to drop support for Mobile and target the other SKUs only. Judging by the numbers it is probably a good idea nowadays, as most users are on Windows 10 Desktop, iOS and Android anyway.

Build Meteor/React mobile app with OSX 10.10

I use Windows and want to build a mobile app for both Android and IOS with Meteor and React. However, the Meteor website says, "Currently, Meteor on Windows does not support mobile builds."
I want to buy a cheap Mac that can do the compiling, so I found a Mac for about $100 from 2009 running OSX 10.10. I'm thinking I can install XCode 7.2.1 on OSX 10.10 and compile the apps.
I've never built an app, other than for the mobile app tutorials I've taken. Do you see any problems with this plan?
"Currently, Meteor on Windows does not support mobile builds."
Actually. It is possible to build android versions in Windows too, but your directory structure should contain no spaces and keep directory names as short as possible e.g. put your project to c:\projects\myapp ot something like that.

Could not find SDK SQLite.WP80 Xamarin and Azure build error

I am building an Azure app with Xamarin.Forms in Visual Studio 2015. My app is happily using both "Azure Mobile Services SQLiteStore" and "Windows Azure Mobile Services" in the Android and iOS builds. However, I am trying to get the same to build and run on WinPhone with little luck. I have tried various things, but typically end up with the following error:
Could not find SDK "SQLite.WP80, version=3.8.7.2". C:\Program Files
(x86)\MSBuild\12.0\bin\Microsoft.Common.CurrentVersion.targets 1886
5 MyApp.WinPhone
Does anybody have a reliable set of instructions for getting Azure Mobile Services SQLiteStore operational on WinPhone 8.0 ?
In my case I had 2 problems
The reference to the SQLite for Windows Phone was missed in the WindowPhone App
As InitLipton said it's necessary to install SQLite for Windows Runtime depended on the windows phone version you are using (In my case was WP Runtime 8)
here are links of the runtime SDKs
WP Runtime 8
Windows Runtime 8.1

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