Hi Niels,
did you follow the readme zile in the zip? Do you load all of the modules? Did you extract all the files from the mod_svn-1.9.2-ap24-x64.zip into e.g. C:\Apache24 ?
LoadModule dav_module modules/mod_dav.so
LoadModule dav_fs_module modules/mod_dav_fs.so
LoadModule auth_digest_module modules/mod_auth_digest.so
LoadModule dav_svn_module modules/mod_dav_svn.so
LoadModule authz_svn_module modules/mod_authz_svn.so
I just downloaded the two zips, unpacked them to C:\ and ran it successfully