in aspack is no jump to oep ,if i remember correctly.
load packed target into olly and try to find it in the code. search for a binary string (ctrl+b): HEX: B8 64 40
or was it without imagebase : B8 64 00 ?
or if you dont find in olly,search in hexeditor.
redirect this to your free space, make your inline patch and jmp to oep.
or if you want be lazy, you could do a search and replace patch with my patcher,which works also with aspack.
kickme.to/diablo2oo2