Old Skritter versions for ios 8

I have old ipad and used skritter two years ago during preparation to hsk4, now im going to prepare to hsk5 but new version of skritter supports only ios10, but im afraid my ipad cant work properly with it. If someone have ipa file of Skritter versions 2.4.0-2.7.0, can you please send it to me to alexrazzum@yandex.ru
I saw files.skritter.com for android but couldnt find any source of old versions for ios nor here neither on the internet.

if you had the iPad backed up on iTunes maybe you could restore it from there.

No i don`t have it. I saw that developers gave earlier versions in TestFlight to someone, i hope they can do it for me.