Computer Help and Support
In reply to the discussion: Need help installing old software on new computer [View all]Denzil_DC
(7,186 posts)can be downloaded in its latest version here: https://www.mailwasher.net/download-mailwasher-free
MailWasher FAQs here: https://www.firetrust.com/products/mailwasher-pro/support/frequently-asked-questions (includes "How can I retrieve my license key?" - it looks like you need an account set up with them which relies on knowing the email address that was used for registration on your old machine, but they include an email link to support@firetrust.com , so you could try that if you don't know that address and all else fails)
It looks like the license allows use on up to three machines, so I can't see why they shouldn't allow you to transfer the license to your new machine.
Fast Photos doesn't have a version specifically for Windows 10, but should work. Download here (and elsewhere, such as Tucows): https://download.cnet.com/developer/pixby-software/i-6256891 The trial period last 21 days, so again if you can't find the product key yourself, you could try emailing the firm (I can't find license details telling me how many machines you can install it on).