precomp+serp+lzma+exe+delta decomperssion error

[medoman]

Hi friends .. it has been a while

So i used Razor12911 UltraArc method whic is amazing

but i'm using kind of old fashion simple installer so it gives me a decompression error code -2 telling me that compression method is unsupported by the arc.ini or unarc.ll
i tried every solution i could think but nothing changed same thing every time
and i'm kind of beginner so take it easy on me if it was a stupied smiole problem