Nobody normally needs an uninstaller to get every last file, and nobody ever made a software purchase on the basis of how well its uninstall program worked. So predictably, uninstallers will often miss or ignore entries in the registry and on your hard drive. Using a third-party uninstaller such as Revo Uninstaller or IObit Uninstaller removes every file from everywhere.
If the trial program leaves a certificate file or other resource to prevent reinstallation, these apps should find and delete it. The Windows registry is an enormous database of stored values describing just about every aspect of every piece of software and hardware on your machine. Many programs will leave traces of themselves in the registry, even if you use the included uninstaller.
Even a file uninstaller might not get every registry entry, particularly if the setup and uninstall programs were designed to leave a registry entry hidden somewhere to prevent double-runs of the trial software. However, this is relatively easy to defeat. All you have to do is take a snapshot of your Windows Registry before you install the trial for the first time.
Then install and use the trial, and when the time period runs out, uninstall it, then restore the Registry to the saved values it had before the trial. However, note that this has the potential of getting your PC into a confused state, as any other changes that other programs have logged to the Registry in the meantime will also be lost.
If the software uses a registry key to track trial installations, then this should work around that. Sandboxing is another useful way to trial new software, as it creates a secure location to install the program within.
One of the best-known sandbox programs is Sandboxie. Not only is it free, it is also very good at what it does. My final tip for reinstalling trial software after the free trial has ended is to use a virtual machine. These are useful in many different situations, but when it comes to trialing new applications they really shine. Not only do they prevent the software from messing with your main operating system, they also prevent any security issues and can be quickly deleted and reinstalled to keep any trial running for as long as you need it to.
Free VM software such as VirtualBox is ideal for this. Create a VM, install an operating system, and set everything up. Take a copy of the image you just created, install the trial software, use it, delete the VM image, and replace it with the copy.
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