You can update without wiping data. xiaomi.eu_THOR_OS1.0.10.0.ULACNXM_14.zip
https://xiaomi.eu/community/threads/hyperos-1-0-stable-release.71170/post-714965
You are using official ROM for India. It has nothing to do with this form and custom ROM from xiaomi.eu team.
If you want to use xiaomi.eu ROM you must unlock the bootloader first.
If you want to continue using the official ROM (global India) please contact the Global Xiaomi forum for help.
You misunderstood what your colleague wrote. https://xiaomi.eu/community/threads/migration-of-ota-metadata-source.72743/post-724497
With this current ROM you also have the current "Update" app. You should now receive a notification of a new update.
1, You download the ROM to PC and extract it in PC. (see picture)
2, look at the picture
3, as mentioned in the instructions, your applications and data will be preserved
It's always a good idea to make a backup.
PS:
You may need to install the necessary drivers on your PC.
Download ROM for Mi 10 Pro (cmi): xiaomi.eu_CMI_OS1.0.5.0.TJACNXM_13.zip
How to update:
https://xiaomi.eu/community/threads/updating-to-latest-hyper-os.74312/post-736610