Even if your scanner is not TWAIN-compatible, you can still continue using ABBYY FineReader! Just do the following:
Note: If there are some pages in your batch already, the first scanned image file name should not be 0001.TIF, but XXXX.TIF, where XXXX is the number of batch pages plus one. For example, if there are 10 pages in your batch, the first scanned image file name should be 0011.tif. If you scan one more file, it should be named 0012.TIF, and so on.
ABBYY FineReader will read step by step all the pages you want it to read.