Hi Juliann,
Thank you for posting your query in Microsoft Community.
I appreciate you for showing interest in Windows 10 and we are glad to assist you. You need to check if the corresponding update
KB3035583 is installed in the system to get the "Windows 10 get app".
Try the below methods and check if it helps:
Method 1:
I suggest you to check if the KB3035583 update is installed on your System. If that update is not installed then try to install it.
Refer to the following Microsoft article on Update installs Get Windows 10 app in Windows 8.1 and Windows 7 SP1 and check if it helps.
https://support.microsoft.com/en-us/kb/3035583
If the issue persists then follow the below method.
Method 2: Perform Clean boot.
A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update.
I suggest you to try the troubleshooting steps from the following Microsoft article and check if it helps.
https://support.microsoft.com/en-us/kb/929135
Note: The steps for Windows 8.1 applies to Windows 10 Insider Preview.
Disclaimer: Please go through the section: How to reset the computer to start as usual after troubleshooting with clean boot of the Kb article to boot the computer in normal startup after fixing the issue.
Hope this information is helpful. Do let us know if you need any further assistance, we'll be glad to assist you.