@Franko
Someone pointed out in another thread that Petro gave Amiga Workbench 3.0 free to the community along time ago.
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Quote from Amiga Format CD #51: AFCD51/+System+/Tools/Workbench/Workbench 3.x/AF_Readme
Here are the DMS archives for the complete Workbench 3.0, in case you haven't
got an install disk, or you corrupt your originals. We can't put later versions
on because we'd need a licence to do so, but Petro Tyschtschenko has given us
permission to include this version of AmigaOS on all AFCDs from now on.
To extract the files, simply have a stack of six disks at the ready for
insertion into df0: (or whichever drive you've set up in AFCDPrefs) and then
double click on the DMS archive icons.
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Files on Amiga Format CD #51: AFCD51/+System+/Tools/Workbench/Workbench 3.x/
Install.dms
Workbench.dms
Locale.dms
Fonts.dms
Extras.dms
Storage.dms
OS3.1_BoingBag1.lzx
AF_Readme