Your mention version is not avail.
pcanywhere 12.6 is latest. You can contact for symantec sale team for purchase.
Why do you want such an old version - if you are trying to connect to a system that is already using v8 you should be aware of the following:
As a result of the security updates, this new version of pcAnywhere is not backward-compatible with, and will not connect to, older versions of pcAnywhere.
Symantec recommends that customers install the latest version of pcAnywhere (12.5 SP4 or Solution 12.6.7) and follow general security best practices. The latest version of pcAnywhere includes all previous hot fixes and the updated security model.