All that I will say is...
[link|http://www.roth.net/perl/packages/|Here] are instructions. They say to use the ppm utility. That is good advice.
You can always do a fresh install of Perl within an arbitrary directory and choose not to put it in the path etc. No update risk there. (In fact if you find something with a name like PerlCTL.dll in your system32 directory and stick it in Perl's bin, then you can have a network install done on any machine afterwards by just adding Perl's bin in the PATH. This will only work if every machine - including the one that did the install - see that directory as having the same name. The installation etches that name inside the executable.)
If you get into trouble, I am sorry but I won't be able to answer questions. However the kind folks at [link|http://www.perlmonks.org|Perlmonks] include several people who are most certainly qualified to offer assistance, and they are very responsive.
Cheers,
Ben
"Career politicians are inherently untrustworthy; if it spends its life buzzing around the outhouse, it\ufffds probably a fly."
- [link|http://www.nationalinterest.org/issues/58/Mead.html|Walter Mead]