Originally Posted by jeffkrol
S-SW10 That's the disc title. I believe that's all you need. Don't need an iso ect...
Just burn a blank disc w/ that title... I believe someone at dp review came up w/ this hack..
Check here.........
Re: Help, I lost my Lab Disk: Pentax SLR Talk Forum: Digital Photography Review
You'll need a blank CD and CD writing program.
You need to create a CD and label it S-SW55. The disk can have anything you want on it. PPL 3.51 will ask for the disk and once your S-SW55 disk is inserted, it will continue on with the install.
Thank you
Russell
Another way to install.........
My friend, you're going to love me for this.
Download PPB and Remote assistant from pentax.
click start>run
drag and drop the photo broswer install file into the run box. put a space and a /s after the text.
like this
c:\downloads\PBLV0361.exe /s
click OK.
Do the same for remote assistant if you need it.
Look on your desktop
shower me with compliments 
@ jeffkrol - You are THE MAN!!! I just wasted time on Live Chat with Pentax and told them that it's ridiculous that they charge for a replacement disc and it's those type of choices that may make Pentax a deal breaker for many people.
Thanks a lot for your wise advise...it worked like a charm.