Server bacchus is OES 2 sp0 x86_64 running IDM 3.5.1

OES 2 cannot be upgraded to sp1 because it will switch eDir to 64 bit, 64
bit eDir is not supported be IDM 3.5.1

Sounds like IDM must be upgraded first. However eDir 8.8.5 is a
requriment for IDM 3.6.1 and there is no upgrade path to eDir 8.8.5 for
OES except through the channel after ugrading to sp1.

So do I just upgrade to OES 2 sp1, let IDM break, then upgrade IDM?