The last free version is v0.1.0 here on itch. All of Act 2 and beyond is for subscribers only until it releases on Steam.
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It does. Office Perks v0.1.0 is a free version, so payments made on itch are considered voluntary payments to the developer. This is noted in the game description:
- Purchasing the game on itch.io will not give you access to future releases. The current version here will not be updated further and can be cosidered the "free" version of Office Perks.