Windows 10: Windows Store update rolling out to Windows Insiders on builds 14342, Insider
Before trying your suggestion I was thinking along the same line as the upgrade being stuck so I tried restarting the computer and that didn't work. Hitting the X not only worked to upgrade the Store I had three other updates that showed up.
Flight Team Leader
Same here, like it cleared a logjam!
Outside the Box
Opened Store...clicked on my Picture (left of Search box),,,,all updated immediately except Store which could not be updated whilst open....shut down Store....reopened Store which showed link to click on to update Store....this closed store and updated leaving confirmation in Action Centre.
Read more: Edge branding now in internal builds of Windows 10, Insiders will have to wait though
Source: A quick update on Windows 10 builds for phones for Windows Insiders
Windows Insider app download: Your request appears to be from an automated process
Frequency and predictability of builds for Windows Insiders
March 9, 2015
Source: Frequency and predictability of builds for Windows Insiders