The only way to get a save onto your computer would be to hex edit through the encrypted code which is not only incredibly hard but also very frowned upon in this community. I'm sorry but if you want to get to Flandre again you are going to have to rebeat stage 1. Honestly if you find stage 1 too hard to replay, you may want to play other fangames before returning to Kamilia 3 to gain skill. Kamilia 3 is a very hard game that gets exponentially harder past stage 1.