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macrumors member
Original poster
I have Wraptor plugins to install but they only work on compressor 3.0.3 or 3.0.4 and I have version 3.0.5...

how can I downgrade?
You can try using
FCS Remover, which will let you remove Compressor individually and then reinstall Compressor from the FCS DVD.
You would then have to download the specific version upgrade you need
here.