I'm afraid I've got some very bad news for you about 3DHA. Even though both versions were released by Encore, version 8 was created by a completely different company than the company that created version 10. So, the two versions are completely different. And, projects you have created in version 8 will not open in version 10.
No, version 9 and version 10 are completely different from version 8. And, Encore does not produce a version of 3DHA which is the same as version 8.
However, since version 8 was actually created by Cadsoft, which also creates other software that is similar to version 8, and which is currently providing assistance for versions 5-8 on their web site at
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