Parallels Desktop for Mac version 11 is available as 1-time purchase of $79.99 for Desktop edition and annual subscription at $99.99 for Pro edition. Version 11 has multiple issues with macOS 10.13, High Sierra.

Not supported of course, but Parallels posted blog showing High Sierra running in Parallels:

Will Parallels 12 For Mac Work In High Sierra

1. A new version of Mac-based virtualization software Parallels Desktop was released today. Parallels Desktop 14 offers disk space efficiency improvements, faster application-launch speeds, macOS.
2. Questions I am running Parallels Desktop 10 for Mac, and I want to upgrade Mac OS to version 10.12. Are there any limitations exist? Is Parallels Desktop 10 for Mac compatible with macOS Sierra?

Here is a screen grab in case they pull the article:

We've been trying to get this to work, but haven't been successful.

So install consistently fails, it can't get past drive verification.

So we know, not supported, but, they blogged that it is (or was?) possible.

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Anyone been able to get this to work?

1. Clone a 10.12.6 OOB VM.
2. Enroll the VM in Developer Seed.
3. Download High Sierra Beta installer.
4. Run High Sierra Beta installer.
5. Verification fails on each attempt, only boots back into Sierra.

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PS, not for nothing but the much superior VMware Fusion Pro 8 does this without breaking a sweat...but I digress...not an option here unfortunately.

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TIA,
Don