The [Restore] button returns the WMC configurations to whatever it was when the backup file you selected was created. Doing a [Restore] right after a [Client Setup] will pretty much undo everything you just did.
DVB Satellite lineups from EPG123 will have -1 for channel numbers since the channel numbers that WMC assigns to the scanned transponder channels is somewhat arbitrary. The EPG123 automatch routine uses channel numbers to do its thing, so if the channel numbers of the stations aren't the same between the tuner channels and the downloaded lineup channels, the results will be wrong. However, there will be some channels that will get automatically matched on the first import based on the NID:TID:SID. I am working on a method to make DVB-S users lives a little easier here (at least for 28.8 and 19.2 satellites), but it is very tedious work on my part to get this set up and ready to go... in other words, this won't be available any time soon.
So you need to perform [Client Setup] and for Step 2 you will need to scan your transponders. There is an alternate method to scanning all your transponders using Software Channel-Sorter for WMC tool
that another user informed me about, but you will have to figure out how to use that on your own. After studying it a bit, it seems that you will perform Step 2, don't scan your transponders, close WMC and then import the MXF file the tool creates for you... then proceed to Step 3. You will still need to manually map the guide listings to the merged channels in WMC, but you won't have to scan all your transponders manually.
Now I'm a little confused with your images on what lineup(s) you are actually using. Is it Astra 28.8, Freesat, or both?