Spring RTS Engine

Hi,

some ubuntu versions of the last Spring engine are not on the PPA :

spring 91.0~12.10~ppa2
spring 91.0~12.04~ppa2
spring 91.0~11.10~ppa2
spring 91.0~10.04~ppa2
spring 89.0~11.04~ppa1
spring 89.0~10.10~ppa1

Any reason for that ?

Thanks