This is a users forum, not Metaquotes.
You should not be losing activations if using the indicator on the same computer.
You have contaced the vendor and if that is no good, only service desk can help you.
Service desk is only for financial related issues.
Losing paid for activations is a financial issue, don't you think?
Anyway, nobody can help in the forum so the service desk is the only option open.
What part of "nobody can help in the forum so the service desk is the only option" was unclear?
You don't lose any activations if you deleting/installing the same purchase on the same computer, under the same MQL5 account.
You can install/delete/re-install your purchase on the same computer, by using only the (1) initial activation.
In any other case you are doing something wrong, or you are upgrading your computer's operating system or hardware.
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