As per your request, I de-authorized all the computers currently registered in your Intel AppUp(SM) center account. Remember that you can use up to five different computers with each individual Intel AppUp(SM) center account.
You can find more information about this and more similar topics from here:
Intel AppUp(SM) center Support
HELLO, I have the same problem as the previous user. please contact me: my email is firstname.lastname@example.org . I have installed the Intel AppUp in just 3 PCs but i had to reinstall because of some problems and now it won't let me enter a 4th computer. Also, I unknowngly installed it in my father's PC just to show him what it was so he will get one for himself... So... right now, i'm not able to install in other PCs and I only use 2 of them . So if could please de-activate all my PCs and I will log into the ones I need that would be great. Thank you very much.
I have de-authorized the machines as requested. You should now be able to sign-in. Can you sign-in to the AppUp(SM) center and let us know if the issue remains?
You may need to re-sychronize any apps you have already downloaded from the AppUp center in case you are getting errors when trying to launch them. To do so you will have sign-in to the AppUp center, click on your name and under 'Profile Data' update your phone number by either adding or removing a 'dash' then save the settings, close and re-start AppUp center.
Alternatively, you can simply re-download the app.
I hope this helps.
Intel AppUp(SM) center
Intel AppUp(SM) developer program