. Download and install the retail version: ProPlus2021Retail.img ProjectPro2021Retail.img VisioPro2021Retail.img 2. Convert the retail version to the Vol version: Download the previous Office2019 retail to Vol conversion script file Convert-C2R.cmd, open it with Notepad, replace all the strings 2019 in the script with 2021 and save it to the installation folder Office16 and execute the successful conversion. 3. Call up the command line under this folder to execute successful activation: cscript ospp.vbs /inpkey:FXYTK-NJJ8C-GB6DW-3DYQT-6F7TH cscript ospp.vbs /inpkey:FTNWT-C6WBT-8HMGF-K9PRX-QV9H8 cscript ospp.vbs /inpkey:KNH8D-FGHT4-T8RK3-CTDYJ-K2HT4 cscript ospp.vbs /sethst:kms.digiboy.ir cscript ospp.vbs /act