The install of the Custom pack is still valid, you just need to copy the new levels over the spare levels in custom pack 1
Problem is that there now more levels than 1 pack so Rovio pack 2 can be copied to custom dir and files replaced there. The maping with the levels to the File name is listed below

level : filename
1 ; "Level1"
2 ; "Level57"
3 ; "Level53"
4 ; "Level3"
5 ; "Level6"
6 ; "Level2"
7 ; "Level4"
8 ; "Level5"
9 ; "Level7"
10 ; "Level8"
11 ; "Level9"
12 ; "Level13"
13 ; "Level10"
14 ; "Level39"
15 ; "Level12"
16 ; "Level15"
17 ; "Level17"
18 ; "Level14"
19 ; "Level16"
20 ; "Level23"
21 ; "Level44"

2-1 ; "Level52"
2-2 ; "Level34"
2-3 ; "Level42"
2-4 ; "Level24"
2-5 ; "Level88"
2-6 ; "Level36"
2-7 ; "Level31"
2-8 ; "Level21"
2-9 ; "Level41"
2-10 ; "Level76"
2-11 ; "Level38"
2-12 ; "Level35"
2-13; "Level20"
2-14 ; "Level26"
2-15 ; "Level66"
2-16; "Level85"
2-17 ; "Level27"
2-18 ; "Level32"
2-19 ; "Level72"
2-20 ; "Level90"
2-21 ; "Level96"


There really not been that much interest in the new levels, so i cant be arsed setting up a new custom install with all the levels.

However if we do get enough interest from people and some feed back, especially on scores, so i can work out 2* and 3* levels. Then i will set up a new cusom pack install complete with a new settign files for custom levels so that each new level has its *scores