Cache Server 5.6 Linux "Exec format error" : where is linux32 version ?

Hi,
I use to have a Cache Server installed on my Synology NAS (running with a Intel Atom x86 CPU). It worked very well untill latest 5.6 update but since the latest release I can't launch it correctly using the ./RunLinux command, I get this error :

./RunLinux.sh: line 20: /volume1/CacheServer/nodejs/linux64/bin/node: cannot execute binary file: Exec format error
./RunLinux.sh: line 20: /volume1/CacheServer/nodejs/linux64/bin/node: Success​

NodeJS seems to be trying to run a linux64 version of the cache server, wich should be supported by my device, and wich was definitely working before. I don't know what to do to get it back.

Thanks for your time,

Sébastien C.

ps : Wrong thread title sorry, cannot update it now to remove 32 bit question