Just to reiterate, you can actually put JSGME into SH3 Cmdr and have a separate MODS folder located there, it's very easy to enable/disable mods created for Cmdr this way & (touch wood) very hard to mess up your SH3 Cmdr.
Yes the single d/l has a higher compression ratio. I would, however, suggest that if you are wanting to pick and choose which skins you want for anything other than GWX that you d/l the multi-part version.
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