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I've tried dragging and dropping as well as copy/paste but the result is always the same:

At around the 350 MB of 1.74 GB point, I get the following error. 

"The operation can’t be completed because you don’t have permission to access "PlayOnMac"."

 

Various troubleshooting actions (based on similar app installation reports online):

• I've rebooted.
• I can freely install other applications without problems.
• When I look at the Info page for PlayOnMac_4.4.3.dmg, I see Read & Write privileges for all the entries in Sharing & Permissions. 
• I'm signed in to the App Store (a strange suggestion but I thought I'd try).
• I tried installing to a different location. Same result.

Anyone got any tips for how I can get POM installed?

Edited by melvynadam

By opening the package and copying it piecemeal, I've discovered that it comes down to three problematic files.

They're all in /Volumes/PlayOnMac/PlayOnMac.app/Contents/Resources/unix/wine/lib/wine

• dism.exe
• winver.exe
• wmplayer.exe

For all three files, I have Read & Write privileges. In fact, the info pages for each file appear the same as the other executables in this folder. 

Edited by melvynadam

**SOLVED** by uninstalling Wine and Wine & WineBottler. Clearly there was a conflict between the Wine in the PlayOnMac installer and the already installed versions.