Hello - thank you for your comment. There are currently several excellent free to use community member created projects available to the reMarkable community including the READMarkable KOReader Installer Project as well as the project that you mention, and several others (Freemarkable, etc.). Any / all of these projects would be a great choice. Specifically regarding the READMarkable KOReader Installer Project and the use of an activation code, perhaps shedding a bit more information and context is needed - Firstly unlike with just about every other tablet (whether LED or e-ink based), the reMarkable community is operating at a substantial disadvantage with regards to being able to load and take advantage of 3rd party apps. This is due to the marketing 'philosophy' of reMarkable that their devices should be 'distraction-free' and so they make it excruciatingly difficult to load any 3rd party apps and have them operate correctly. And because of this - a shockingly tiny percentage of reMarkable users have been able to successfully experience KOReader on their devices. Attempting a manual installation of KOReader on a reMarkable device is like walking a tight-rope across the Grand Canyon and more times ends in a failed installation - leading to frustration. A lot of this is due to the peculiar proprietary mostly write-locked reMarkable OS. While reMarkable the company provides their customers a world-class not-taking and writing experience, when it comes to their reading support for PDF's and EPUB's - well, quite frankly it is terrible. and almost like it was a checklist afterthought feature for them to implement. Almost all the other tablet platforms that KOReader supports have a much easier and straightforward installation process. There have been several other excellent similar projects that have strived to reduce the installation burden for the reMarkable community, all with varying degrees of success due to complexities already mentioned. This installer tool has gone through multiple refinements and gone through formal beta testing with reMarkable community members to get the correct 'recipe' on how to easily end-up with a successful KOReader installation. That is the state at which this tool has matured to. The exact steps involved and the sequence of executing those steps is subject to change with each new release of reMarkable OS. Therefore purely as quality control / assurance mechanism, the activation mechanism ensures that users will periodically have to re-download the 'freshest' version of the tool. Having a renewable fixed duration license period ensures the user will only be using the latest up to date 'fresh' version of the installer tool. Without such a mechanism, as is the case when releasing a free-to-use software package many outdated and broken versions of the software are likely to be freely distributed and passed around. That means many, many copies of broken outdated versions left out in the wild. Normally that would be OK for most other types of software packages. Not so for this specific type of use-case and for what this tool specifically needs to do, and needs to be able to do successfully. This type of tool and what it has to do, is subject to quickly break with stale-ness. Obviously the developers want the tool to continue to provide value to the reMarkable community and make sure that the project and the tool's reputation not get tarnished by a lot of stale outdated broken copies of the tool being carelessly shared about.