What
wookie ookie said, but if you didn't "export" (can't remember the term used in the VN) at the end of .12, then Chapter 2 won't have your saves to try to open. If you didn't do that step, then you need to reopen using the "Chapter 1" version of the VN and load, then "export" and "save" your paths - give them a name, maybe a slot position, because otherwise they just get a number string. Also, when naming them, the old save grid was a 3x3 - the new one is 4x3, meaning if you use a slot-save naming method, it doesn't translate the same anymore. It's a little tedious if you have several saves, but not as tedious as entering stats for them all.
And, finally, keep in mind that while things like pregnancy and kinks were save-by-save in Ch1, they are controlled by menus in Chapter 2. The saves will come over as you made them, but if you had a "non-pregnancy" set and a "pregnancy set" of saves, like I did, having "pregnancy" turned on in Chapter 2 could result in pregnancy in your non-pregnancy saves if you don't watch your creampies (so, a little like life
).
If you deleted your Chapter 1, you can find it for download on the OP.