Also, don't even think about trying to use bots on these maps. Skulltag will hang up indefinitely trying to generate the bot nodes for most of them due to the size of the maps, and the bots would just jump off cliffs the whole time anyway.
In addition, Skulltag 98a has a couple of bugs when playing SPACEDM5. Most importantly, the infinite-looping vertical teleport in Angsty Water Map (S5DM09) is quite broken in netplay, but some flat alignments in S5COOP02 and S5DM10 also break online in 98a. Torr has graciously fixed these Skulltag bugs for us, so using a newer version (at the time of this writing this would mean using a development build, but eventually 98b or anything after it) will avoid those issues.