what is your compression code?..if it may custom code make arc.ini file
1.use arc.ini in your isdone section
if not ISArcExtract ( 0, 60, ExpandConstant('{src}\data-1.pkg'), ExpandConstant('{app}'), '', false, '',
ExpandConstant('{tmp}\arc.ini'), ExpandConstant('{app}'), False) then break;
in your ISArcExtract ( 0, 33, section :total is 100 for progress.
you may use 33,33,34 {sum=100}
2.use the same version of unarc.dll or unarc.exe
3.if you use srep use the same in installer inclueded file.
test it. It may work..
