Now, my question is this that is this right to use this kind of invocation

Yes, this is the correct invocation

Can I get problems in some other perl versions if I use this?

Not with anything perl 5.* , you shouldn't worry about older perl's

What kind of effects does this have on the program?

Nothing besides duplicating work and all the pitfalls associated with that. If you can't install modules, you should consider distributing a perl, ie PAR/pp/http://www.cava.co.uk//PerlApp

Is there some better way to load a particular module only if its installed on a machine?

Not really, all the different helpers ( if, Module::Pluggable, Module::Load ... ) eventually call require