Windows 10 Insider Preview build not showing up? Check out the fixes

10 things to know about Windows 10 — Reuters

Last week Microsoft released three Windows 10 Insiders Preview builds - 10158, 10159 and 10162 - as well as the ISOs for last build ahead of the Slow Ring release.

But users, especially those on Surface Pro 3, reported they were unable to find the update. Do not worry if you are having issues updating to the new preview version, as a content curator in the Microsoft support community has posted a list detailing how you can find the latest Windows 10 Insiders preview builds. Check out the following fixes.

Ensure that your user account is connected with your Insider-enabled Microsoft Account.
Press [Windows]+[L] to lock your computer. You will get to know that you are using a Microsoft Account if your email address shows on the lock screen and your computer unlocks with your email password.
Verify that you can view your Insider statistics with the Windows Insider app.
Verify that you can load the Feedback app and see the currently trending feedback.
Open Settings and navigate to Update & security >> Windows Update >> Advanced options.
Ensure that the Slow build ring is selected. Switch to it if you are on the Fast build ring.
Hit the [<-] button and check for updates.
When it's done, reboot your computer.

Open Services (right-click Start, click Computer Management and navigate to Services and Applications >> Services).
Stop Windows Update.
Stop Background Intelligent Transfer Service.
Open Windows Explorer and navigate to C:WindowsSoftwareDistributionDownload.
Press [Ctrl]+[A], and then [Shift]+[Delete]. Confirm that you want to delete everything in the Download folder.
Reboot your computer.

Open Settings and navigate to Update & security>> Windows Update.
Check for updates.
When it is done checking/downloading, switch back to the Fast build ring.
Check for updates again.
When it's done, reboot your computer.

Open Settings and navigate to Update & security>> Windows Update.
Check for updates. Hopefully this time you get to see build 10159.

If it found the update, but the download progress is stuck at 0%, open Task Manager and watch your Internet bandwidth usage (in the Performance tab; click More details if it's missing).
When your Internet bandwidth usage drops down near 0, the download is finished or hanging.
Open Services.
Stop Windows Update.
Stop Background Intelligent Transfer Service.
Start Windows Update.
Check for updates, and the update should resume where it left off.