This error will read Upgrade to iCloud for Windows failed.
This post onMiniToolwill teach you how to fix the upgrade to iCloud for Windows failed error.
It can also keep Apple services including photos, contacts, and calendars in sync with Windows PCs.
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Sometimes, you may find that you fail to upgrade to iCloud for Windows.
There are many reasons for this error.
Older versions of Microsoft Visual C++ Redistributable may interfere with the installation.

Additionally, the Firewall prefs may interfere with the installation of the package.
Fortunately, some fixes below will help you get rid of this iCloud error code 101.
This post provides some tips to help you fix cant download or install iCloud for Windows 10/11.
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So, you’ve got the option to grant it more privileges by running iCloud Installer as administrator.
Here are the steps.
Step 1: Open theSearchbox and typeiCloud Installerin it.

Step 2: Right-choose it from the result list and chooseRun as administrator.
Work with the following steps.
Step 1:OpenControl Panel, change the view intoLarge icons, and chooseWindows Defender Firewall.

Step 2: choose theTurn Windows Defender Firewall on or offoption.
Step 3: Check theTurn off Windows Defender Firewalloption underPrivate web connection settingsandPublick web connection settingsand click onOK.
Do you know how to peek if Firewall is blocking a port or a program?
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In this post, we will show you how to do this job using different methods.
You are expected to wipe the iCloud files to see if this error can be fixed.
The operations are as follows.
Step 1: Right-punch theStartbutton and chooseRunto open theRundialog.
Step 2: jot down%temp%in the box and pressEnter.
Step 3: Delete all files in the Temp folder.
After deleting them, you need toreinstall the iCloudagain.
you’ve got the option to choose to repair it according to the instructions below.
Step 1: Open theSettingsapp, and click onApps>Apps & features.
Step 3: In the pop-up window, click onRepairto start the repair process.
In this case, you are supposed to start the service for Windows Installer.
Here is how it’s possible for you to do it.
Step 1: Open theSearchbox, typeServices, and pressEnter.
Step 2: Scroll down the list until you findWindows Installer, right-hit it, and chooseStart.
Updating it can solve some problems.
Here is a way.
Step 1: Press theWin + Ikeys to open theSettingsapp and click onUpdate & Security>Windows Update.
Step 2: hit theCheck for updatesbutton.
If an update is available, it’s crucial that you clickDownload & installnext to it.
A Windows update might slow down or mess up your PC.
Hope they can help you solve the problem.