I managed to find a build that works but it's been synchronizing with the network for almost a day and it's around 75% still. Is that normal?
I don't think so. I just synched my old wallet again without any problems, although it really takes long to see the wallet itself on your screen. It's probably already synching on the background before it shows up.
I'm currently at block 691050. I just transfered my lasts MRC to Alcurex in order to swap them for the new MRC.