Most samples libraries use rar to compress the prodcut for delivery. Some rar application on some OS might work a little different. If you have issues extracting rars please try a different unrar application for your OS. There are many that are free. Also make sure every rar file is the same size (except for the last rar) and compare to the rar file on the downloads section. Sometimes rars get corrupted on download so please try downloading again. If you still have issues please make sure to specifcy what OS and rar application you are using. For those new to rar, there are various tutorials online but the fast version is that you need to download all rar files into one folder, then click on the first rar (file.rar1) and it will automatically extract all. If you hit rar2 some files might not open. If you still have issues please use different unrar applications as some Windows or Mac Ear apps might not work sometimes.