Why can I not install more than three apps?

Question

I have just started learning how to make iOS apps, and am using the free personal developer account.

I have made four apps so far, but do not seem to be able to inst

Answer 1

I believe there was not a satisfactory answer yet...

It is a big sudden problem that came with OSX10. There are several errors I and others report:

on new project:

1/ The maximum number of apps for free development profiles has been reached.

on the project working on macOS before 10 (8 or 9) .

1/ mycode0001 requires a provisioning profile. Select a provisioning profile for the "Debug" build configuration in the project editor.

2/ Code signing is required for product type 'Application' in SDK 'iOS 10.0'

It is critical for quite a few developers to know how to address this!