As the title states, I have been developing and testing an app for Iphone. I have got it to install to an iphone via it being plugged into the Mac. But, I would like to get the app place it on my webserver then via a website allow someone to download and install the app. I tried following various tutorials, but as shown below after archiving the app, the export and other buttons are greyed out. Have also made sure 'Generic iOS devices' selected. What could be causing this ?
You have to use Apple TestFlight or use a third party service to allow your beta to be distributed for testing. One good service is HockeyApp, which I am using currently and it is very cheap $10/month.
Without having the UDID of your client, you simply can't!
What is causing this may be that you are not enrolled in the correct Apple developer program.
A stock iOS device will only install an app from a link on a website if the app is signed by certificate from an Enterprise Developer program enrollment (or Ad Hoc provisioned). The Enterprise distribution method is only allowed to employees of the enrolled corporation.
Ad Hoc deployment to devices registered to your enrolled Developer account is also supported by stock iOS devices.
One other possibility is to put a link to your entire Xcode project on your website, with instructions on how anyone with a Mac and Xcode can build your app and then run it on on their device.
来源：https://stackoverflow.com/questions/33922189/how-to-distribute-my-finished-app-without-app-store