Remove Temp-Files

[Fireball22]

Hi,
i've a problem with Plesk 7.5.4!
Since i've use the Updater in Plesk my Server-HDD is over then 500 MB in use.

I've found out, that the follow directory is very big:
/root/psa/PSA_7.5.4/SUSE9.3_std.updates

In this directory there are over then 100 big files.

May I clear the directory "SUSE9.3_std.updates", without to get some problems with Plesk?
I think these files are only temporarly.
Is that true?

I'm sorry for my bad Englisch...

Fireball22