Download and install and iTunes for Windows directly from Apple's website. Log into the iCloud desktop app using your Apple ID.
Now that AltStore is installed, you can use it to install any .ipa file you have downloaded. how to install ipa file using altstore
Before opening AltStore on your device, you must trust your own developer certificate: Go to > General > VPN & Device Management . Under "Developer App," tap your Apple ID email address. Tap Trust [Your Email Address] and confirm your choice. Step 4: Download an IPA File Download and install and iTunes for Windows directly
Now that AltStore is active and trusted, you can use it to install any custom .ipa file you have downloaded to your device. Before opening AltStore on your device, you must
(Windows only - download the Apple version, not the Microsoft Store version). iCloud (Windows only - download the Apple version). Part 1: Installing AltServer on Your Computer