Is the Updater safe to use?

[RooMeat]

Current server specs are as follows:
httpd 2.0.46-40.ent
bind 9.2.4-EL3_10
courier-imap 3.0.3-rhel3.build71041118.17
frontpage 5.0.2.2634
mailman 2.1.1-5
mysql 3.23.58-1
postgresql-server 7.3.6-7
webalizer 2.01_10-15.ent
php 4.3.2-14.ent
mod_python 3.0.3-3.ent
coldfusion Component was not installed
psa-migration-manager 7.1.6-rhel3.build71041118.17
SSHTerm 0.2.2-rhel3.build71041118.17
spamassassin 2.63-0.2
psa-qmail 1.03-rhel3.build71041124.11
psa-qmail-rblsmtpd 0.70-rhel3.build71040817.01
psa-proftpd 1.2.9-rhel3.build71041118.17
psa-logrotate 3.7-rhel3.build71041118.17
psa-spamassassin Component was not installed
tomcat4 4.1.24-full.2jpp
mod_perl 1.99_09-10.ent
perl-Apache-ASP 2.57-rhel3.build71041118.17
drweb 4.31.7-rh1
drweb-qmail 4.31-rhel3.build71040817.01
psa-bu 7.1.6-rhel3.build71041118.17
psa-agent 1.3.2-2_psa7.1

I have use 4PSA to optimize the server and also install spam and virus protection.
My problem now is I have a customer that needs the newer frontpage extensions.
Is the Updater safe to run?? or will it break things?
When I go in to the updater, it lists Plesk 7.1.7 AND Plesk 7.5.3
Do I need to do all the updates in the earlier version prior to running the newer version?

Thanks for your help.