export declare class TrmServerUpgrade {
    private currentVersion?;
    private installVersion?;
    private static instance;
    private dummy;
    private constructor();
    static getInstance(): TrmServerUpgrade;
    static createInstance(currentVersion: string, installVersion: string): void;
    throwError(e: Error): void;
    deleteFromTms(): boolean;
    removeSkipTrkorr(): boolean;
    executePostActivities(): boolean;
    removeComments(): boolean;
    refreshTmsTxt(): boolean;
    changeTrOwner(): boolean;
}