Thank you very much to
Entai44,
Carldric Clement and
KaktoR for their help!
I am very pleased to say that I'll have my first ever repack finished soon. I cannot thank you guys enough for the tips, tricks and how kind you have been to me.
I wish you all the best for the future,
BR
Edit: Still getting Unarc -6 unable to read archive and other Unarc -6 errors when testing. Error code is same but error message sometimes changes. Editied Compressors.ini to include Xtool for precomp and LOLZ because I used those in UltraARC to make my archive, but still no change.
Feel free to take a look at my installer to see if you know where things are going wrong. This is the template I customised based on ASIS and currently has no custom branding. I moved everything around a bit, and intend to use it in compact mode.
https://mega.nz/#!9wBg3Y6B!ABV_NMgy3...0lRaIJ6EdsNwNE