Stanley,
I may wonder whether your 24GB is a too odd number in itself. Not because it wouldn't be allowed as such, but because I never really anticipated that. It is or 16GB or 32GB. And now I am looking at this number which starts with 512, while the number in Joachim's (also Mani's) screenshot (in that topic behind the link) shows 266, which is about half of your 512. The 32GB is also twice the 16GB ...
I feel this can be a tough one because I have no means to check (or I regard that too difficult). All I know is that exactly this disk (SSD) goes to those with 32GB of memory (including the Stealth) and that I have another one (this is another version) for 16GB. So all we "agreed" in ad-hoc fashion is that you'd better have the version for 32GB of memory because otherwise your additional 8GB would be a waste (can't be utilized). But I never thought of the possibility that the version that goes into RAM would be too large for your 24GB. I don't even know whether that is so, to be honest. Or ? ...
Uhm ... look below.
That's actually your RAM-OS Disk ... it was given the size of 24GB (so the 266 vs the 512 would be the comparison for this indeed, as the one for 16GB is 13GB in size).
Houston ! ...
Two options :
1. I give you a quite long guide to shrink your OS with 8GB (and I see a small possibility you running in troubles with that (it took me very long to find this long-threaded procedure);
2. You get yourself an additional 4GB of memory (which may come down to buying 8GB and take out the 4GB which may occupy too many DIMM slots).
3. Bonus option : I send you a new one for 16GB (and no, I am not going to make you a version for 24GB because it is all way too much error-prone - sorry !).
My advice is #2 but making 32GB out of your current 24GB system could also be a bit challenging (you must start looking for free slots, may not find any, must remove the 4GB which is replaced by the 8GB and your system must be able to take that).
Peter
PS: By email I told you that by guarantee it would not be about too few memory (because for nobody that appeared to be the case). But I must withdraw that now, obviously.