I recently added Dimension Expander and OTT to my plugin library. On my iMac they're working fine (Logic 10.3) , the plugins appear under the 'xfer records' tab. On my macbook (updated to Logic 10.4 before installing plugins) the plugins don't show at all. I installed the same way I did on the iMac. Serum and Serum FX both work fine btw.
I think DE and OTT are great plugins and I'd wish to continue to run projects on my laptop too