@ nym : that is a built in Reaper dialogue. It is alwas supposed to ask for missing samples. The two options it offers are "search" and "locate file". If you use search n point it at the correct folder, it should populate all the samples correctly.
The samples download is version 2 from this page :
http://www.drumgizmo.org/wiki/doku.p...ts:muldjordkit
Version 2 is the 1.5 GB download. It will note work with the older 800 MB version 1 download.
I tested by moving renaming the samples folder and it asked th search option above and then loaded the samples correctly without a problem.
But i will see if there is a folder path type problem as roboplankton said.