(Untested idea) I'd suggest creating your own Root CA with an expire-date far in the future. Install it's public key as a trusted certificate and all derived certificates should not prompt any issues anymore
If you can download the files, why can't you upload as well?
You can pay by Wire transfer, MasterCard, Visa, PayPal or even Bitcoin[1] so there is at least one anonymous payment option available 1: https://shop.threema.ch/terms
(Untested idea) I'd suggest creating your own Root CA with an expire-date far in the future. Install it's public key as a trusted certificate and all derived certificates should not prompt any issues anymore
If you can download the files, why can't you upload as well?
You can pay by Wire transfer, MasterCard, Visa, PayPal or even Bitcoin[1] so there is at least one anonymous payment option available 1: https://shop.threema.ch/terms