When oem is set to 2 (LSTM + Legacy fallback) within createWorker, the Legacy data should be automatically downloaded if it has not already been downloaded. However, this does not appear to be happening at present. Unless the user already has this data downloaded and cached, or forces it to be downloaded using options, using oem mode 2 results in an error. See motivating example below.

#859 (comment)

For users who experience this issue before it is patched, it can be easily resolved by forcing the Legacy code/data to be downloaded by setting the options legacyCore and legacyLang both to true.

const worker = await Tesseract.createWorker("eng", 2, {legacyCore: true, legacyLang: true});