Used a Windows 7 32-bit bottle with MS Office 2013 Professional Plus already installed.
Ran just the installer and it errors (as the other post says). It seemed to be erroring during the install of the .Net framework so I installed the .Net Framework 4.52 into the same bottle. The installer for 2.0 SP2 failed (couldn't download file) but everything else succeeded. Re-ran the Grammarly install and made it to the main install screens.
Selected Word and Outlook plugins. Dialog was a flickering mess but seemed to start installing and then errored;
Error codes: N/A, N/A, N/A, 0x80070005
Error details: installer-92cb9f2d-af9f-4bb4-b31f-cd1ccfa1d5b7