ABBYY has never released an official portable version of FineReader 15. ABBYY is a large enterprise software vendor that relies on licensing servers, product activation, and software assurance plans. A truly "official" portable executable would be a piracy nightmare because a single USB drive could be copied infinitely.
If you own a legitimate license for FineReader 15 (Standard or Corporate), you can create a semi-portable workflow yourself. Abbyy Finereader 15 Portable
ABBYY frequently releases updates to fix OCR bugs and improve AI models. A cracked portable version is frozen in time. If you encounter a corrupted PDF, you cannot patch it. ABBYY has never released an official portable version
The demand for a portable version stems from several legitimate needs: If you own a legitimate license for FineReader
While the idea of a free, portable FineReader is tempting, downloading these builds is extremely dangerous.
While ABBYY does not offer a dedicated, official "portable" version of FineReader PDF 15