this is my step if you use 26.4
1) create android 10 instance. dont start yet. click on nut icon(setting) on the top right of instance.
2) enable magisk from magisk row and root from root row
3) start the instance. let it load the drawer
4) pick file transfer (right drawer) and import magisk 26.4
5) open installed magisk app and pick direct install. reboot
6) open up magisk again after reboot. there would be popup up require additional setup. just hit cancel for now. it should shows magisk is installed
7) click on top right gear icon (setting) and look for zygisk setting. turn it on. you can install any module of your choice at this point. dont reboot from magisk if you did
8) tap on vphone icon (should be yellow peeping tom on your right middle screen). turn off root. hit restart
9) magisk and zygisk should work from this point
and for people still following the step and still failed installing magisk, try this:
1) turn off the instance
2) turn off root and magisk
2) turn on "reset boot partitions" in magisk section
3) turn on the instance
4) repeat the step for install magisk
I might try this if my set up crashes.
Here's what I did.

Create Instance on Android 10 ROM

Tap the

or Settings and Tick On (Yellow) Magisk and Root then Restart

Download on Github:

Magisk v24.0

LSPosed-v1.9.2-7024-zygisk-release.zip

Core_Patch_3.8_656f2bbc_(Android_10-12L).apk

Import Magisk > Install > Options (Patch vbmeta on boot image ticked on) > Next > Method (Direct Install) > Let's Go

Tap v floating icon > Settings > Tick Off Root > Restart

In Magisk > Tap

Tick On Zygisk (Beta) > Restart if prompted

Import LSposed zip file (Found in Documents) > Magisk > Modules > Install from Storage > Locate LSposed zip file > Restart

Use ZArchive (or any) locate manager.apk from LSposed zip file > Install

Import Core Patch > Notification Bar > Tap to Activate > Tick on Enable Module > Tap

and Make sure to tick on:

Allow Downdrage

Disable digest verify

Disable compare signature

In the Notification Bar > Tap LSposed to Activate Parasitic Manager > Create Shortcut (LSposed with Android Icon) > Uninstall the Original LSposed Manager > Reboot VPhoneGaga