You could try this link perhaps:
https://gretil.sub.uni-goettingen.de/gretil.html#Upan

Sent from Outlook for Android
From: INDOLOGY <indology-bounces@list.indology.info> on behalf of Cicely A Bonnin via INDOLOGY <indology@list.indology.info>
Sent: Wednesday, February 28, 2024 4:54:59 AM
To: indology@list.indology.info <indology@list.indology.info>
Subject: [INDOLOGY] seeking digitally-searchable Maitrī Upaniṣad
 
Dear all,

I am looking for a digitally-searchable version of the Maitrī Upaniṣad, aka Maitrāyaṇīya, etc. Does anyone have any leads?

With thanks,
Cicely Bonnin


Cicely Bonnin BSc, BEd, MA(Adv) Qld
Visiting Fellow, South Asia Studies, Harvard University (2023-25)
PhD candidate, Asian Studies, The University of Texas at Austin