* Download the XPI file of the [latest release](https://github.com/UB-Mannheim/zotero-ocr/releases). * In Zotero, go to Tools → Add-ons and drag the .xpi onto the Add-ons window. * Possibly, adjust the path to Tesseract in the add-on options.
I'd be surprised if the app was tested using flatpack installs of Zotero, so might just be that, but have you tried the path specified in the error message, ie. /app/share/zotero/pdftoppm
## Prerequisites
- Tesseract OCR is installed
- for Windows see https://github.com/UB-Mannheim/tesseract/wiki
- for Linux, Mac see https://github.com/tesseract-ocr/tesseract/wiki
- `pdftoppm` from poppler library is downloaded and copied to the other scripts in the Zotero directory
## Installation
To install the extension:
* Download the XPI file of the [latest release](https://github.com/UB-Mannheim/zotero-ocr/releases).
* In Zotero, go to Tools → Add-ons and drag the .xpi onto the Add-ons window.
* Possibly, adjust the path to Tesseract in the add-on options.
To what directory for a pdftoppm executable is it referring?
/home/USER/.local/share/flatpak/app/org.zotero.Zotero/x86_64/stable/021402b4c4c3e353f1e2346f4b2408bdca37cc1ffe6851a6209b3b1e7daad4f0/files/share/zotero