No attempt is made to keep older versions of PaPCo supported. The user is expected to obtain the latest version: reports of bugs and problems will only be attended to in the context of the latest PaPCo version.
The CCR home page from which PaPCo can be obtained (see Chapter 3) will only keep the latest version. There is no archive of older versions of PaPCo core. There is a limited archive of older modules only.
If you have PaPCo products written with Versions older than 5.0 you might not be able to read them anymore in anything up to PaPCo 08. You will need to redefine the product under the latest version. From PaPCo 09 onwards, this restriction has been removed, and ALL PaPCo products should be readable under PaPCo 09.