Hi, please visit this website;
decompressorIt's the first red link in the list. called "UnPBO v1.5"..click it and download.
Your an experienced editor right from what I've seen in the past?
It's easy , just install/open the program after download. Then after the program is opened goto the OFP directory click on campaigns and then click on the campaign you want to decompress.
Then in that same folder which was campaigns, go in there and you'll find the decrompressed folder which has all the UnPBO'd missions for SQM files in there that you can just copy and paste into your usermission directory for the editor.
It's pretty simple.
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if you need any help just let me know..