The AMISYS Data Warehousing product will not run on the version of
ALLBASE that comes with 5.5. You must retrofit ALLBASE (I think it is
G.0 but I may be wrong.)

As for running AMISYS 8.X on 5.5, I ran the AMISYS 6 loop on 5.5.

You may contact me directly for further information. The  AMISYS
listserver may net you more answers. The address is:
[log in to unmask]

I don't remember the subscription procedure but its free and painless.