I am still trying to forget the nightmare that was V8. My advice wasn't requested in this regard, but V9 is SO much better, that I can't believe a firm would try to save $600 in exchange for the misery that V8 is capable of. I'll bet that you've already wasted more in lost fees than the upgrade would have cost. And the longer you delay upgrading, the higher that potential cost is.
You really should consider upgrading to AC9 and dumping 8.1. (Just my opinion.)
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10