Sometimes a Servoy client simply refuses to download correct.
I suppose most of you are familiar with the fact that you can empty Java Web Start (JWS) cache on that machine but there is more.
It is my advice to perform the following 2-3 or 4 steps plan when there is an issue:
1. empty the clients Java Web Start Cache
2. empty the clients browser cache
3. optionally restart the clients system
4. lastly empty the contents of ${servoy root}/server/depends on servoy version/plugins/* and ../beans/*
Hope this helps, certainly step 2 was unknown to me but has proven to be very helpful!
Cheers