Edit: I found all of these games, here;
https://igrozavod.ru/
P6: https://yadi.sk/d/uXaaL_tLXjKQo
P7: https://yadi.sk/d/bFbcwPVPXjMuE
P8: https://yadi.sk/d/gr-Q4JJVXjyZJ
P9: https://yadi.sk/d/BALeUtxGYQXEu
Edit 2: It has download limit...
Petka 6:
http://www.legendsworld.net/adventure/game/8678
https://www.4shared.com/folder/hPGCVrpq ... sMode=NAME
petka6.part02.rar and maybe more.
Petka 7:
http://www.legendsworld.net/adventure/game/8709
https://www.4shared.com/folder/7XPN6q9c ... sMode=NAME
Petka7.part05.rar and Petka7.part13.rar
Petka 8:
http://www.legendsworld.net/adventure/game/8757
https://www.4shared.com/folder/_ZFrdWY0 ... sMode=NAME
Petka-8.part06.rar and Petka-8.part07.rar
Petka 9:
http://www.legendsworld.net/adventure/game/8794
https://www.4shared.com/folder/-yCN0EdH ... sMode=NAME
petka9.part14.rar and maybe more files are missing.