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If your scenario involves entirely air-gapped machines, this solution won't be feasible. However, from a financial standpoint, you can access Microsoft Office for free by using its web version. This version includes many features found in the desktop variants and may suffice for numerous use cases.

Personally, I find the perpetual licenses less appealing because they are costly, particularly when used on multiple devices. For instance, with a perpetual license, you're typically limited to installing it on just a desktop and a laptop. In contrast, subscriptions offer greater flexibility in this respect, accommodating usage across several devices.